The formula of the hydrated sulfate for Epsom salt is MgSO₄.5H₂O. The number of water molecules in this hydrated sulfate formula is equal to 5.
A hydrate is a compound containing a specific mass of water in the form of H₂O. To determine the molecular formula of the hydrate,[anhydrous solid⋅xH₂O.
], moles of water per mole of anhydrous solid (x). Step of the hydrate formula :
determines the mass of water released from the compound. This is accomplished by subtracting the weight of the anhydrate from the weight of the hydrate. Converts the weight of water to moles. To do this, divide the mass of water by the molar mass of water to get the number of moles of water. Converts the mass of residual anhydrous into moles.Determines the molar ratio of water to anhydrous. Write formulas using molar ratios.Considering a 210.4 g sample of Epsom salt hydrate, heating MgSO₄.xH₂O. releases water, so the mass of the resulting anhydrate is 120.4 g. What is the molecular formula of this hydrated sulfate?
Determine the mass (in grams) of water leaving the compound.= 210.4 g MgSO₄.H₂O. - 120.4 g MgSO₄
= 90 g H2O.
Convert the weight of water to moles:= 90 g H₂O/ (18 g/mol H₂O) = 5 mol H₂O.
Convert the mass of the remaining anhydrous to moles:= 120.4 g MgSO₄ /(120.4 g/mol MgSO₄ ) = 1 mol MgSO₄.
Determine the molar ratio of water to anhydrous compound:= 5 mol H₂O /1 mol MgSO₄ = 5:1.
Since there are 5 moles of H₂O for every mole of MgSO₄, the molecular formula is MgSO₄.5H₂O. There are therefore 5 molecules of water in the formula of hydrated sulphate.
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Complete question:
determine the formula of the hydrated sulfate for Epsom salt, MgSO₄ nH₂O, the number of water molecules is usually a small whole number expressed as an integer before h2o in the formula. show calculations and use correct significant figures.
what is rigor mortis
The natural process of the body's muscles hardening after death is known as rigour mortis. Adenosine triphosphate (ATP), which is necessary for muscular relaxation, is depleted, which causes it to
The postmortem condition known as rigour mortis affects the body's muscles, causing them to stiffen and make movement impossible. The lack of ATP, the energy molecule necessary for muscular relaxation, is the cause of it. When ATP generation stops after death, the muscles constrict and stiffen. After 2-4 hours of death, rigour mortis normally starts and can persist up to 48 hours until the muscles start to relax as a result of decomposition. Age, temperature, and physical state at the moment of death are a few variables that might affect the severity and length of rigour mortis.
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What is the energy of a mole of photons of light that have a frequency of 8.23 × 10^15 Hz?
A. 3.38 × 10^J
B. 1.45 × 10^J
C. 5.45× 10^J
D. 8.79
The concept quantum theory of radiation is used here to determine the energy of a mole of photons. Here the energy of a mole of photons of light that have a frequency of 8.23 × 10¹⁵ Hz is . The correct option is C.
What is quantum theory of radiation?According to quantum theory of radiation energy can be absorbed or emitted in the form of electromagnetic radiation called quantum. The energy of the radiation absorbed or emitted is found to be directly proportional to the frequency of radiation.
The equation is:
E = hν
ν - Frequency
h - Planck's constant
E = 6.626 × 10⁻³⁴ Js⁻¹ × 8.23 × 10¹⁵ s⁻¹
= 5.45 × 10⁻¹⁸ J
Thus the energy of a mole of photons of light is 5.45 × 10⁻¹⁸ J.
Thus the correct option is C.
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What volume, in liters, does 128 grams of O2 occupy at STP?89.6 L22.4 L67.2 L44.8 L
Answer:
89.6 L
Explanation:
The volume of a gas at STP (Standard Temperature and Pressure) is 22.4 L per mole of gas. To determine the volume of 128 grams of O2, we need to convert the mass of O2 to moles of O2:
First, we need to determine the number of moles of O2 in 128 grams of O2 using the molar mass of O2:
molar mass of O2 = 2 x atomic mass of O = 2 x 16.00 g/mol = 32.00 g/mol
moles of O2 = mass of O2 / molar mass of O2
moles of O2 = 128 g / 32.00 g/mol = 4.00 mol
Now that we have the number of moles of O2, we can use the volume at STP for one mole of gas to calculate the total volume of the sample:
volume of O2 = number of moles of O2 x volume at STP per mole of gas
volume of O2 = 4.00 mol x 22.4 L/mol = 89.6 L
Therefore, 128 grams of O2 at STP occupies a volume of 89.6 L.
Describe three ways in which compounds and mixtures differ.
Compounds have fixed composition, properties and are chemically bonded while mixtures have variable composition, properties and are physically mixed.
Mixtures and combinations are two distinct sorts of substances. Compounds are unadulterated substances made out of at least two components synthetically reinforced together in a decent proportion, while blends are blends of at least two substances that are truly blended yet not artificially consolidated. Three manners by which mixtures and combinations vary are:
Piece: Mixtures have a proper creation and a particular proportion of molecules or particles, while blends have a variable synthesis with no particular proportion.
Properties: Mixtures have unmistakable properties, like a particular dissolving point, edge of boiling over, and compound reactivity, while blends have a scope of properties that rely upon the substances in the combination.
Detachment: Mixtures must be isolated by substance implies, like through a compound response, while blends can be isolated by actual means, like filtration, refining, or chromatography.
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what makes a solvent ideal for use in a recrystallization?
The solvent ideal for the use in the recrystallization is the one in which product will be the very soluble at the high temperatures but the only slightly soluble at the room temperature or lower.
The Recrystallization process is the technique that is used to purify the solid compounds. The Solids tend to be the more soluble in the hot liquids than in the cold liquids. During the process of the recrystallization, an impure solid compound will be dissolved in the hot liquid until the solution become saturated, and then the liquid is allowed to be cool.
The ideal solvent for crystallization of the particular compound is one in which product will be the very soluble at the high temperatures . The primary consideration is that solvent should be unreactive.
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c o2 → co2 (m o2 = 32 g/mol; m co2 = 44 g/mol) when 78.0 g of carbon dioxide (co2) are produced, what mass of oxygen is present in the product?
56.7 g oxygen. One carbon atom is covalently doubly bound to two oxygen atoms in each of the molecules that make up carbon dioxide, which has the chemical formula CO2.
At room temperature, it exists as a gas. In the atmosphere, carbon dioxide serves as a greenhouse gas because it absorbs infrared radiation despite being transparent to visible light.
It has increased from pre-industrial levels of 280 ppm to a trace gas in the Earth's atmosphere at 421 parts per million (ppm), or roughly 0.04% by volume (as of May 2022). The fundamental driver of both these elevated CO2 concentrations and climate change is the burning of fossil fuels.
Groundwater, lakes, ice caps, and oceans all contain dissolved carbon dioxide. As atmospheric CO2 concentrations rise, carbon dioxide dissolves in water to create carbonate, primarily bicarbonate (HCO 3), which contributes to the acidification of the ocean.
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what is zn molar mass?
Zn has a molecular mass of 65.3800 g/mol. The mass of one mole of a material, measured in grams per mole (g/mol), is known as molar mass or molar weight.
What is molar mass?
Mass per mole is a definition of molar mass. In other terms, molar mass is the total mass of all the atoms in a substance that makes up a mole. It is measured in gram-per-mole quantities.
For atoms or molecules, molar mass is displayed. The molar mass is simply the element's mass expressed in atomic mass units in the case of solitary elements or individual atoms. To put it another way, an atom's atomic mass and molar mass are precisely equal. Molar mass can be used to determine a particle's identity because it is equivalent to atomic mass for individual atoms. He, for instance, has an atomic mass of 4. There is only one helium molecule in nature, meaning that it has only one atom, so its molar mass is also 4.
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what is nystatin swish and swallow
Nystatin is an antifungal medication that is commonly used to treat fungal infections of the mouth and throat. Nystatin swish and swallow is a method of delivering the medication directly to the affected area in order to treat these types of infections.
The swish and swallow method involves taking a liquid suspension of nystatin and swishing it around in the mouth for several minutes before swallowing it. The medication is designed to coat the mouth and throat, allowing it to come into contact with any fungal infections that may be present.
To use the swish and swallow method, the patient should first shake the medication well to ensure that it is evenly mixed. The recommended dosage of nystatin will vary depending on the severity of the infection and other individual factors, so patients should follow the instructions provided by their healthcare provider.
To administer the medication, the patient should take a small amount of the suspension into their mouth and swish it around for several minutes, making sure to coat the entire mouth and throat. The medication should not be swallowed immediately, as it is important to allow it to come into contact with any fungal infections that may be present.
After several minutes of swishing, the patient should swallow the medication, being careful not to spit it out or rinse their mouth with water immediately after. This allows the medication to continue to work in the mouth and throat, providing effective treatment for fungal infections.
Side effects of nystatin swish and swallow are typically mild and may include nausea, vomiting, and diarrhea. Patients who experience more severe side effects or allergic reactions should contact their healthcare provider immediately.
In summary, nystatin swish and swallow is a method of delivering an antifungal medication directly to the mouth and throat in order to treat fungal infections. Patients should follow the instructions provided by their healthcare provider and swish the medication around in the mouth before swallowing. Side effects are typically mild, and patients who experience more severe side effects or allergic reactions should contact their healthcare provider immediately.
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what mineral would be appropriate to use as an after-bath powder?
The mineral appropriate to use as an after bath powder is talc based on its physical properties.
The physical properties of the mineral making it suitable for use as after bath powder is its silky nature and hardness on contact with liquid. The low Mohs hardness is important property to use the powder for mentioned desired use.
The high hardness make cause gritty nature of the powder resulting in cake formation. The cake formation results on contact of water with salt. The latter properties will render the salt useless thus requiring contrasting properties.
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Classify the conditions given as indicating that a reaction is at equilibrium, is not at equilibrium, or that the conditions may occur in either state. --At equilibrium 1.The forward and reverse reactions occur at equal rates. 2.The concentrations of products is and reactants are constant. --Not at equilibrium: 1.The concentration of reactants is slowly increasing. 2.The forward reaction is occurring at a very slow rate. --May or may not be at equilibrium: 1.The products and reactants have equal concentrations. 2.The concentration of products greater than the concentration of reactants.
The equal rate of forward and backward reactions is achieved at equilibrium state. Constant concentrations of products and reactants can be occurred in the equilibrium state.
What is chemical equilibrium ?Chemical equilibrium is the state where no exchange of chemical energy takes place, thus, the rate of forward reaction equals to the rate of backward reaction.
The concentration of reactants are constant at the equilibrium state. If any imbalance occurs in the system the system itself shift to a new equilibrium by balancing all the disorders.
The forward reaction is occurring at a very slow rate is not an equilibrium condition.
Concentration of products greater than that of reactants as well not n equilibrium condition. Both their concentration will be equal at equilibrium.
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why are atoms likely to share electrons?
The atoms of some elements share electrons because this provides them with a full valence shell. All atoms strive to attain a full valence shell, just like noble gases. This is the most stable electron arrangement.
If atoms can't attain a full outer shell by transferring electrons, they resort to sharing. In this mode, each atom can estimate the shared electrons as facets of its own valence shell. This sharing of electrons is covalent bonding. Atoms will covalently bond with other atoms in a mandate to gain more stability, which is attained by forming a full electron shell. By sharing their outermost (valence) electrons, atoms can suffice up their outer electron shell and gain stability.
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Will 10g of k2s04 completely dusdolve in 100 g of water at 50 degrees celsius
Yes, 10g of K₂SO₄ will completely dissolve in 100g of water at 50° Celsius.
The solubility of K₂SO₄ at 50 degrees Celsius is 17g per 100g of water. Since the amount of K₂SO₄ being dissolved (10g) is less than the solubility at this temperature (17g), it will completely dissolve.
To calculate solubility, you need to know the maximum amount of solute that can dissolve in a given amount of solvent at a specific temperature. This is known as the solubility limit. Once you know this, you can use the following equation to calculate solubility:
Solubility = (mass of solute) / (mass of solvent)
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When a more complex compound breaks down into two simpler ones
Answer:
Displacement reaction
Explanation:
When 2.50 grams of ammonium chloride are dissolved in 100.0 mL of water inside an insulated Dewar flask with a total heat capacity of
at a constant pressure of one bar, a temperature decrease of is observed. Calculate the value of
for the dissolution of ammonium chloride in units of
. Is this an exothermic or endothermic process? Assume that no energy is lost as heat through the Dewar flask during the reaction.
Since the enthalpy change is positive, this is an endothermic process.
What is endothermic process?An endothermic process is a chemical or physical process that absorbs heat from its surroundings. During an endothermic process, energy is transferred from the surroundings into the system, which results in a decrease in the temperature of the surroundings. This means that the system requires an input of energy in order to proceed.
Here,
To calculate the value of enthalpy change, we can use the formula:
ΔH = -q / n
Where:
q is the heat absorbed or released in the reaction
n is the number of moles of the solute (ammonium chloride)
We can calculate the heat released (q) in the reaction using the formula:
q = m × C × ΔT
Where:
m is the mass of the solution
C is the heat capacity of the Dewar flask
ΔT is the change in temperature of the solution
The mass of the solution can be calculated by converting the volume of water to mass, assuming a density of 1.00 g/mL:
m_solution = 100.0 mL × 1.00 g/mL = 100.0 g
The number of moles of ammonium chloride can be calculated using its molar mass:
molar mass of NH4Cl = 14.01 g/mol + 1.01 g/mol + 35.45 g/mol = 53.47 g/mol
n = 2.50 g / 53.47 g/mol = 0.0468 mol
The heat released can be calculated as:
q = 100.0 g × 1.76 J/g°C × (-8.00°C) = -1.41 × 10⁴ J
Substituting these values into the formula for ΔH, we get:
ΔH = -(-1.41 × 10⁴ J) / 0.0468 mol = 3.01 × 10⁵ J/mol
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Please help, A, B, C, or D?? Thank you very much if u help
The temperature on the axis of an H-R diagram is increasing from right to left. Hence, option D is correct.
What is H-R diagram ?One of the most crucial tools for studying star evolution is the HR diagram, often known as the Hertzsprung-Russell diagram (HR diagram). It was separately created by Ejnar Hertzsprung and Henry Norris Russell in the early 1900s and shows either the color of stars (or spectral type) against their absolute magnitude or the temperature of stars against their brightness.
Every star goes through several developmental stages that are determined by its internal structure and method of energy production depending on its starting mass.
The temperature and luminosity of the star fluctuate with each of these stages, and as the star develops, it may be seen moving to various locations on the HR diagram. This demonstrates the real power.
In this diagram, the temperature is decreasing from left to right and luminosity increases from bottom to top. Hence, option D is correct.
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Transcribed image text: 问题1 25 Resonance can only occur when the elements in the molecule keep the same formal charge. True False
True. Resonance occurs when the formal charges of all atoms in the molecule remain the same.
Resonance occurs when the formal charges of all atoms in a molecule are the same. This means that electrons are shared between atoms in the molecule, resulting in a stabilizing effect. A change in the formal charges would disrupt the resonance and consequently, the stability of the molecule. The electrons must move in such a way that the formal charge of each atom is conserved. This way, energy is minimized and the molecule is stabilized. Without the same formal charge, the resonance would not be able to occur and the molecule would not be stable. In conclusion, resonance can only occur when the elements in the molecule keep the same formal charge, otherwise, the molecule will not be stable.
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True. Resonance occurs when the formal charges of all atoms in the molecule remain the same.
Resonance occurs when the formal charges of all atoms in a molecule are the same. This means that electrons are shared between atoms in the molecule, resulting in a stabilizing effect. A change in the formal charges would disrupt the resonance and consequently, the stability of the molecule. The electrons must move in such a way that the formal charge of each atom is conserved. This way, energy is minimized and the molecule is stabilized. Without the same formal charge, the resonance would not be able to occur and the molecule would not be stable. In conclusion, resonance can only occur when the elements in the molecule keep the same formal charge, otherwise, the molecule will not be stable.
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an alloy is a mixture of elements that has metallic properties.
True. An alloy is a solid solution consisting of two or more metallic elements, or a metallic element and a non-metallic element.
The properties of an alloy are usually different from those of its constituent elements. The reason for this is that the atoms of different elements in an alloy interact with each other differently than they would if they were in their pure elemental form. This interaction can lead to changes in the electronic and crystal structure of the alloy, which in turn can affect its physical and chemical properties. Some common examples of alloys include brass (copper and zinc), stainless steel (iron, chromium, and nickel), and bronze (copper and tin).
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Complete question:
An alloy is a mixture of elements that has metallic properties. True or False
as the concentration of ferrous iron decreases your sample absorbs _______ light, therefore ______ light reaches the detector.
As the concentration of ferrous iron decreases, your sample absorbs less light, therefore more light reaches the detector.
What happens when a sample containing ferrous iron is exposed to light?When a sample containing ferrous iron is exposed to light at a specific wavelength, some of the light is absorbed by the ferrous iron molecules in the sample. This results in a decrease in the intensity of the light that reaches the detector, which is measured as the absorbance of the sample.
The amount of light absorbed by the ferrous iron molecules is directly proportional to their concentration in the sample. Therefore, if the concentration of ferrous iron in the sample decreases, there are fewer molecules to absorb the light, and more light reaches the detector. This results in a lower absorbance reading for the sample.
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Which circuit is a series circuit? A. A Circuit has battery at top connected to three components across each other's leads B. Three components connected across each other to a common battery C. Two batteries connected to one component and switch across each other's leads D. A Battery connected to two components such that only one path for current to flow.
Answer:
THE CORRECT ANSWER IS D
Explanation:
A, B, and C are incorrect. I took the test so I know. Hope this helps
which reaction is not a reduction–oxidation reaction? a) AgNO3 + NaCl -> AgCl + NaNO3. b) CH4 + O2 -> CO2 +H2O. c) Li + Cl2 -> LiCl. d) NaClO3 -> NaCl + O2.
The reaction that is not a reduction-oxidation reaction is:
c) Li + Cl2 -> LiCl.
The transfer of electrons from one substance to another is the foundation of a reduction-oxidation (redox) reaction. Lithium (Li) loses an electron to chlorine (Cl2) in this reaction, resulting in lithium chloride (LiCl). However, because neither lithium nor chlorine changes its oxidation state, this reaction is not considered a redox reaction.
On the other hand, all the other options involve the transfer of electrons from one substance to another, indicating a redox reaction.
a) AgNO3 + NaCl -> AgCl + NaNO3: In this reaction, silver (Ag) gains an electron to reduce from Ag+ to Ag, while chlorine (Cl) loses an electron to oxidize from Cl- to Cl2.
b) CH4 + O2 -> CO2 +H2O: In this reaction, carbon (C) loses electrons to oxidize from -4 to +4, while oxygen (O) gains electrons to reduce from 0 to -2.
d) NaClO3 -> NaCl + O2: In this reaction, chlorine (Cl) loses electrons to reduce from +5 to -1, while oxygen (O) gains electrons to reduce from +6 to -2.
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why was it important to use di water when making soda solutions?
It is important to use deionized (DI) water when making soda solutions because it removes any impurities or ions that may interfere with the accuracy and consistency of the experiment or reaction.
Ordinary tap water contains minerals and ions that may alter the concentration of the soda solution and cause unwanted chemical reactions, leading to inaccurate results. Using DI water ensures that the solution is as pure as possible and eliminates any potential sources of error. Additionally, DI water has a consistent composition, which makes it easier to control and reproduce results.
Deionized (DI) water is water that has had all of its ions, such as minerals and salts, removed through a process called ion exchange. During ion exchange, the water is passed through a series of resins that contain charged ions that attract and bind to the ions in the water, effectively removing them.
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6. Energy generated from
nuclear fusion in the sun's core is what causes
the sun to "shine" and radiate energy through
the solar system. In fusion, four hydrogen
atoms fuse together to become one helium
atom. The atomic mass of hydrogen is 1.00794
and the atomic mass of helium is 4.0026.
How does the difference in the mass of four
hydrogen atoms and one helium atom help
explain the energy released by the sun?
The atomic mass is 2.775 are released by the sun.
What is mass ?
The amount of matter in a body is referred to as its mass. The kilograms is the kilograms, which is the SI unit of mass (kg). Mass is defined as: Mass = Density /Volume.
What is atom ?
The smallest unit of matter that can participate in a chemical reaction is an atom. Electron, proton, and neutrons make up an atom. Atoms are incapable of existing alone.
Therefore, atomic mass is 2.775 are released by the sun.
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Calculate the wavelength of a photon of green light that has a frequency (v) of 5.76 x 10^14 s^1
The wavelength of the photon of the green light is found to be 5.2 x 10⁻⁷ m.
The relationship between the wavelength and the frequency of the light is related as,
C = λν
C is the speed of green light and that is 3 x 10⁸, ν is the frequency of the green light which is given to be 5.76 x 10¹⁴ s⁻¹ and λ is the wavelength of the green light.
Now, putting all the values in their places in the above formula we will get the wavelength of the green light.
3 x 10⁸ = λ(5.76 x 10¹⁴ s⁻¹)
λ = 5.2 x 10⁻⁷ m.
So, the wavelength of the photon of green light is found to be 5.2 x 10⁻⁷ m.
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help plssssssssssssss
Answer:
B. each aquarium . . . the surroundings
Explanation:
Since the Final tempurature is less than the original. Both aquariums released thermal energy
help plssssssssssssss
Answer:
B. Each aquarium... the surroundings
Explanation:
You can tell from the the temerpatures given that the aquariums released thermal energy to the sureoundings.
Give the approximate bond angle for a molecule with a tetrahedral shape.A) 109.5°B) 180°C) 120°D) 105°E) 90°
The bond angle for a molecule with a tetrahedral shape is given as 109.5° C. Hence, the correct option is A.
Generally, bond angle is defined as the angle which is present between the two bonds i.e. angle between the two orbitals containing bonding electron pairs around the central atom in a complex molecule or ion. It is usually measured in the terms of degrees and is calculated using spectroscopic method.
Generally, the valence shell electron pair repulsion (VSEPR) theory is defined as a model used to predict 3-D molecular geometry based on the number of valence shell electron bond pairs among the atoms in a molecule or ion. This model usually assumes that the electron pairs will often arrange themselves in order to minimize the repulsion effects from one another.
Therefore, according to VSEPR Theory, the bond angle of a tetrahedral molecule is 109.5°. Hence, the correct option is A.
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Calculate the standard enthalpy change for the reaction at 25 ∘ C. Standard enthalpy of formation values can be found in this list of thermodynamic properties. Mg(OH)2(s)+2HCl(g)⟶MgCl2(s)+2H2O(g)
ΔH∘rxn =
The standard enthalpy change for the reaction at the 25 °C is the -16.3 kJ.
The chemical reaction is as follows :
Mg(OH)₂(s) + 2HCl(g -----> MgCl₂(s) + 2H₂O(g)
The ΔHf Mg(OH)₂ = - 924.5 kJ/mol
The ΔHf HCl = - 92.30 kJ/mol
The ΔHf MgCl₂ = - 641.8 kJ/mol
The ΔHf H₂O = -241.8 kJ/mol
The standard enthalpy change of the rection is as :
ΔH∘rxn = ∑ ΔHf product - ∑ ΔHf reactant
= ( -641.8 + (2× -241.8 ) - ( - 924.5 + ( 2 × - 92.30 ))
ΔH∘rxn = - 16.3 kJ
The enthalpy change for the reaction is -16.3 kJ.
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9. which compound in the following pairs would you expect to have the higher absolute entropy? briefly explain your rational for each. i. 1 mol co2(g) and 1 mol co(g) ii. 45 g sc(s) and 45 g sc(g) iii. 1 mole n2o4(g) in 1l and 1 mole n2o4(g) in 2l iv. 1 mole nh3(g) in 1l at 298k and 1 mole nh3(g) in 1l at 498k
1 mole n2o4(g) in 1l and 1 mole n2o4(g) in 2l compound in the following pairs would you expect to have the higher absolute entropy.
The correct option is (iii).
What is absolute and residual entropy?The lowest point on the enthalpy temperature scale is known as absolute zero. The entropy that a substance still possesses even at absolute zero is referred to as residual entropy. The vitreous state, or glass, is the most prevalent non-equilibrium state seen. Carbon monoxide is an additional example.
Is positive absolute entropy a constant?Free energy has to be negative for a process to be spontaneous. Reason: Changes in enthalpy and entropy are connected to changes in free energy. If a process is spontaneous, its change in entropy must always be positive.
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When 200. Ml of 2. 0 m naoh(aq) is added to 500. Ml of 1. 0 m hcl(aq), the ph of the resulting mixture is closest to (a) 1. 0 (b) 3. 0 (c) 7. 0 (d) 13. 0
the pH of solution will be one(1)
A measure of how basic or acidic aqueous or other liquid solutions are is called pH. The expression translates the hydrogen ion concentration, which normally ranges between 1 and 1014 gram-equivalents per litre, into values between 0 and 14. It is commonly used in chemistry, biology, and agronomy. Pure water, which has a pH of 7, has 107 gram-equivalents of hydrogen ions per litre, making it neutral (neither acidic nor alkaline). Acidic solutions are those with a pH below 7, while basic, or alkaline, solutions are those with a pH above 7.
Mole = concentration x volume 10 moles of NaOH are precisely neutralised by 10 moles of HCl in a volume of 50 milliliters.
NaOH + HCl [tex]\rightarrow[/tex] NaCl + [tex]H_2O[/tex]
that is 20 -10 = 10 HCl mole
Con of [tex]H^+[/tex] =[tex]\frac{ no\: of\: mole\: of\: H^+}{ total\: volume\: of\: solution}[/tex] (50+50 ml = 100 ml)
=[tex]\frac{10}{100}[/tex] = 0.1
pH = log ( H+)
= log (0.1) = 1
so ,the pH of solution will be one(1)
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The small red dots in the simulation could represent which of the answer choices? a. Na+b. O2c. Cl-d. glucose. e. O2.
The small red dots in the simulation represents the b) O2
Oxygen is a chemical element with the symbol O and atomic number 8. Oxygen, a member of the chalcogen group of the periodic table, is a highly reactive nonmetal and an oxidizing agent that readily forms oxides with most elements and other compounds. The main uses of oxygen are:
1) Smelting, refining, and manufacturing of steel and other metals. 2) Chemical production by controlled oxidation. 3) rocket propulsion; 4) medical and biological life support; 5) mining, production and manufacture of stone and glass products.
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