. Calculate the specific heat of the water using the q=mcAT equation (q is heat energy, m ga
= mass (0.5g), c = specific heat of water (4.18 J/g°C), and AT is the change in
temperature (final temperature - initial temperature)). Plug in your final and initial
temperatures below and calculate.

Answer:

The energy value of the vegetable oil is 12.8 kcal/g.

Explanation:

We can use the following formula to calculate the energy value of the vegetable oil:

Energy value = energy released / mass of sample

We are given that the mass of the sample is 0.35 g and the energy released is 17.9 kJ. We need to convert the energy to calories and the mass to grams to get the answer in kcal/g.

1 kJ = 1000 J

1 cal = 4.184 J

So,

17.9 kJ = 17.9 x 1000 J = 17900 J

17900 J = 17900 / 4.184 cal = 4274.5 cal

Now we can calculate the energy value:

Energy value = 4274.5 cal / 0.35 g = 12212.9 cal/g

Finally, we can convert the answer to kcal/g by dividing by 1000:

Energy value = 12212.9 cal/g / 1000 = 12.8 kcal/g (rounded to one decimal place)

The percent by mass of hydrogen in NH3 is 82.4%.

To find out the number of moles of hydrogen in 34 grams of NH3, first we need to find the number of moles of NH3 which can be calculated by dividing 34 grams by the molar mass of NH3 (17.0 grams/mol). Therefore, the number of moles of NH3 is 2 moles. As NH3 contains 3 moles of hydrogen per mole, the number of moles of hydrogen in 34 grams of NH3 is 2 x 3 = 6 moles.

Molecular mass of NH3 = 1 x atomic mass of N + 3 x atomic mass of H

= 1 x 14.01 + 3 x 1.01

= 17.03 g/mol

Mass percent of hydrogen in NH3 = (3 x atomic mass of H) / molecular mass of NH3 x 100%

= (3 x 1.01 g/mol) / 17.03 g/mol x 100%

= 82.4%

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20. 0 g of CaCl₂ is dissolved in 250. M of the water in a coffee cup calorimeter. The temperature of the solution will increases from 25 °C to 37 °C. The enthalpy change for the reaction is 69.73 kJ/mol

Mass of the solution = mass of water + mass of calcium chloride

Mass of the solution  = 250 g + 20 g

                                        = 270  g

Mass of water = ?

The Volume of water = 250 mL

The Density of water = 1.00 g/mL

The Mass = Density × Volume

m = 1.00 g/mL × 250 mL

    = 250 g

The heat gained by the solution :

q = m c ΔT

q = 250 × 4.814 ( 37 - 25 )

q = 12552 J

The Heat energy will released during the reaction  = q'

q' = - q = - 12552 J

Moles of calcium chloride, n = 20 / 111

                                               = 0.180 mol

The enthalpy change = q' / n

                                    = - 12552 / 0.180

                                   = 69733.3  J/mol = 69.73 kJ/mol

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Taking into account the definition of Avogadro's Number, 1.38529×10²¹ molecules in 0.0023 mole of CO₂ .

Avogadro's number is defined as the number of particles (atoms, molecules, ions, electrons) in 12 grams of carbon-12, that is, in one mole of the substance or compound.

Its value is 6.023×10²³ particles per mole and it applies to any substance.

Considering the definition of Avogadro's number, you can apply the following rule of three: If 1 mole of CO₂ contains 6.023×10²³ molecules, 0.0023 mole of CO₂ contains how many molecules?

amount of molecules of CO₂= (0.0023 moles × 6.023×10²³ molecules)÷ 1 mole

amount of molecules of CO₂= 1.38529×10²¹ molecules

Finally, there are 1.38529×10²¹ molecules.

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Using roman numerals, the oxidation number of the metals in the given compounds are given below:

I. SnCI₂ (Tin (II) Chloride): Oxidation number of Sn = II

2. SnCl₄  (Tin (IV) Chloride): Oxidation number of Sn = II

3. Cu₂O  (Copper (I) Oxide): Oxidation number of Cu = I

4 CuO (Copper (II) Oxide): Oxidation number of Cu = II

An atom's or ion's oxidation number, also known as its state or oxidation number, refers to the number of electrons the atom or ion has either received or lost in comparison to a neutral atom.

Electropositive metal atoms of groups I, 2 and 3 shed a particular number of electrons, while their positive oxidation numbers remain constant.

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The percent composition of carbon in vinegar is 40.04%. This is because acetic acid is a molecule composed of four atoms 4 H, 2 C and 2 O atoms, with the molecular formula of acetic acid is [tex]CH3COOH[/tex].

To calculate the percent composition of carbon in acetic acid, we must first determine the mass of each element in the molecule. The atomic mass of carbon is 12.011, the atomic mass of hydrogen is 1.008, and the atomic mass of oxygen is 15.999. When multiplied by their respective subscripts, we get the relative molecular mass of acetic acid as 60.046. Now that we know the relative molecular mass of acetic acid, we can calculate the percent composition of carbon by dividing the mass of carbon in the molecule (12.011) by the total molecular mass (60.046). This gives us 0.4004, which can be expressed as a percentage by multiplying it by 100 giving us 40.04%.

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The volume of 0.800 M NaOH solution required to reach the third equivalence point is 67.5 mL

The volume of 0.333 M NaOH solution required to reach the second equivalence point is 156 mL

From the question, we are to determine the volume of NaOH required to reach third equivalence point

Question 1:

The third equivalence point is reached when all three hydrogen ions (H+) in phosphoric acid have reacted with hydroxide ions (OH-) from the sodium hydroxide solution.

From the given balanced equation,

Each molecule of phosphoric acid reacts with three molecules of sodium hydroxide, we can calculate the number of moles of sodium hydroxide required to reach the third equivalence point as follows:

Number of moles =Concentration × Volume

Number of moles of H3PO4 = 0.250 M x 0.0720 L = 0.0180 mol

Number of moles of NaOH required = 3 x 0.0180 mol = 0.0540 mol

Now, we can calculate the volume of the 0.800 M NaOH solution required to supply 0.0540 mol of NaOH:

Volume of NaOH = 0.0540 mol / 0.800 M = 0.0675 L = 67.5 mL

Hence, 67.5 mL of the 0.800 M NaOH solution is required.

Question 2:

The second equivalence point is reached when all the hydrogen ions (H+) in two molecules of oxalic acid dihydrate have reacted with two molecules of hydroxide ions (OH-) from the sodium hydroxide solution. Since each molecule of oxalic acid dihydrate reacts with two molecules of sodium hydroxide, we can calculate the number of moles of sodium hydroxide required to reach the second equivalence point as follows:

Number of moles of H2C2O4•2H2O = 0.400 M x 0.0650 L = 0.0260 mol

Number of moles of NaOH required = 2 x 0.0260 mol = 0.0520 mol

Now, we can calculate the volume of the 0.333 M NaOH solution required to supply 0.0520 mol of NaOH:

Volume of NaOH = 0.0520 mol / 0.333 M = 0.156 L = 156 mL

Hence, 156 mL of the 0.333 M NaOH solution is required

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In ZnSO3, O is oxidized to a value of two. S in ZnSO3 is oxidized to +4 by zinc. ZnSO3 has a +2 Zn oxidation number.

When two or more separate chemical components are mixed in a specific proportion, the resultant substance is called a compound. The collision of the components creates biochemical connections that have been complex to break.

There is just one sort of atom per element, making them pure substances. When a variety of different type of elements are combined chemically in predetermined ratios, the resultant product is called a compound. The Earth naturally has about 94 of the almost 118 elements that make up the periodic table.

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Answer:

a. The overall balanced chemical equation for the reaction is: 3O3 → 3O2 + O b. The intermediate in the mechanism is O3. c. The order of the reaction is first order with respect to O3 and second order with respect to O. d. The rate law for the overall reaction is rate = k[O3]^1[O]^2.

A rock that begins with   4000 atoms of a radioactive isotope would have the following remain;

A. After one half-life, 2000 atoms would remain.

B. After two half-lives, 1000 atoms would remain.

C. After three half-lives, 500 atoms would remain.

D. After four half-lives, 250 atoms would remain.

If 25% of the isotope remains, that means 75% has decayed. Since each half-life represents 20 million years, two half-lives (40 million years) would result in 25% of the original isotope remaining, and therefore four half-lives (80 million years) would result in 6.25% of the original isotope remaining. Therefore, the rock must be older than 40 million years but younger than 80 million years. Since the answer choices only include 40 million years and 60 million years, the closest answer is C, 40 million years.

Each rock has decayed 50% of its radioactive element, which means they have all undergone the same amount of decay. However, since each isotope has a different half-life, the amount of time it takes to undergo 50% decay will be different. The rock dated with isotope C has the longest half-life, and therefore has undergone the least amount of decay and must be the oldest.

Carbon-14 dating is the best choice for dating organic materials, such as cotton cloth.

Using the half-life of Carbon-14 (5730 years), we can calculate the age of the burial site using the formula t = (ln(0.167) / ln(0.5)) x 5730. This results in an age of approximately 14,798 years.

The best way to obtain an absolute date for the sequence of rocks would be to date the volcanic ash layer using a radiometric dating method such as Uranium dating, which would provide an age for the time at which the ash was deposited. This age could then be used to bracket the ages of the sedimentary rocks above and below the ash layer.

Conclusively,  Using the half-life of the parent isotope, we can calculate the age of the sequence of rocks using the formula t = (ln(0.783) / ln(0.5)) x length of the half-life. Since we don't know the specific isotope being used, we can't calculate the exact age, but the closest answer choice is E, 1.588 billion years.

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Answer:

the concentrations is 0.0760 M.

Explanation:

The concentration of chloride ion in the final solution is approximately 0.1900 M.

To find the concentration of chloride ion in the final solution, we need to consider the reaction between NH₄Cl and FeCl₃. The reaction can be represented as follows:

NH₄Cl (aq) + FeCl₃ (aq) → NH₄FeCl₄ (aq)

In this reaction, one mole of NH₄Cl reacts with one mole of FeCl₃ to form one mole of NH₄FeCl₄. The balanced chemical equation shows a 1:1 molar ratio between chloride ions (Cl⁻) and NH₄FeCl₄.

First, let's calculate the moles of chloride ions from each solution:

For the NH₄Cl solution:

Volume of NH₄Cl solution (V1) = 25.0 mL = 0.0250 L

Molarity of NH₄Cl solution (M1) = 0.2450 M

Number of moles of chloride ions from NH₄Cl solution = M1 * V1

Number of moles of chloride ions from NH₄Cl solution = 0.2450 mol/L * 0.0250 L

Number of moles of chloride ions from NH₄Cl solution = 0.006125 mol

For the FeCl₃ solution:

Volume of FeCl₃ solution (V2) = 55.5 mL = 0.0555 L

Molarity of FeCl₃ solution (M2) = 0.1655 M

Number of moles of chloride ions from FeCl₃ solution = M2 * V2

Number of moles of chloride ions from FeCl₃ solution = 0.1655 mol/L * 0.0555 L

Number of moles of chloride ions from FeCl₃ solution = 0.00918325 mol

Now, let's add the moles of chloride ions from both solutions:

Total number of moles of chloride ions = Moles from NH₄Cl + Moles from FeCl₃

Total number of moles of chloride ions = 0.006125 mol + 0.00918325 mol

Total number of moles of chloride ions = 0.01530825 mol

Finally, let's calculate the concentration of chloride ions in the final solution:

Total volume of the final solution (Vf) = Volume of NH₄Cl solution + Volume of FeCl₃ solution

Total volume of the final solution (Vf) = 0.0250 L + 0.0555 L

Total volume of the final solution (Vf) = 0.0805 L

Concentration of chloride ions in the final solution (Mf) = Total moles of chloride ions / Total volume of the final solution

Concentration of chloride ions in the final solution (Mf) = 0.01530825 mol / 0.0805 L

Concentration of chloride ions in the final solution (Mf) ≈ 0.1900 M

Therefore, the concentration of chloride ion in the final solution is approximately 0.1900 M.

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Answer:

14

Explanation:

The net ionic equation is;

Zn(s) + Ni^2+(aq) ----> Zn^2+(aq) + Ni(s)

In chemistry, a net ionic equation is a chemical equation that only shows the species that are involved in a chemical reaction and undergo a change. It excludes spectator ions, which are ions that are present in the reaction mixture but do not participate in the reaction itself.

To write a net ionic equation, the first step is to write a balanced chemical equation for the reaction, including the state symbols for each reactant and product.

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Answer:

1.  It describes the number of atoms in 1 mole of an element.

2. 195.08 g Pt / 195.08 g/mol = 1 mol Pt

   1 mol Pt x 6.022 x 10^23 atoms/mol = 6.022 x 10^23 atoms

    The correct answer is: 6.022×10^23 atoms

3. Cu: 63.546 g/mol

  S: 32.065 g/mol

   O (4 atoms): 4 x 15.999 g/mol = 63.996 g/mol

   Molar mass of CuSO4 = 63.546 + 32.065 + 63.996 = 159.607 g/mol

    The correct answer is: 159.607 g/mol

X is phosphorus. The chemical formula XF3 indicates that X is a group 15 element, which can only be either nitrogen, phosphorus, arsenic, or antimony.

Phosphorus is an essential element for all living organisms, and is found in proteins, DNA and cell membranes. It is also a key component of energy-storing molecules like adenosine triphosphate (ATP), which powers cellular activity. Phosphorus is found in soil, water and food sources, and is essential for plants to synthesize essential compounds like sugars, starches, and fats. It is also a major part of fertilizers, and is key for maintaining healthy soil and promoting plant growth. In humans, phosphorus is necessary for bone and teeth formation, energy metabolism, and the growth and maintenance of cells. Deficiencies in phosphorus can cause stunted growth, bone deformities, and a weakened immune system.

The dipole moment of XF3 indicates that X is not nitrogen, because nitrogen does not form molecules with a dipole moment. Therefore, X must be phosphorus.

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The bird's potential energy is 2,802.8 J.

The potential energy of an object is the energy it has due to its position in a gravitational field. The formula for potential energy is as follows:

  PE = m × g × h

Where PE is the potential energy, m is the mass of the object, g is the acceleration due to gravity, and h is the height of the object.

In this case, the mass of the bird is 0.52 kg, the acceleration due to gravity is 9.8 m/s², and the height is 550 meters. Plugging these values into the formula, we get:

  PE = 0.52 kg × 9.8 m/s² × 550 m

  PE = 2,802.8 J

Therefore, the potential energy of the bird is 2,802.8 joules.

Your question seems incomplete. The completed version should be as follows:

A 0.52 kg bird flying at an altitude of 550 meters. What is the bird's potential energy?

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The mass of sliver deposited at the cathode during the electrolysis of Nitrate (AgNO₃) solution is 0.0011 gram.

The term electrolysis is defined as a chemical reaction that happens when an electric current is pass over through a substance. The substance gets or loses an electron during chemical reaction.

Given:

Current = 0.10 ampere

Tome = 10 second

Molar mass of Ag = 108 g mol−1

1 Faraday = 96500 C

Q = i × t

=0.1 × 10 × 60

= 60 Coulombs

Weight of the substance deposited = ZQ

Z=M/nF​

n-factor of AgNO3 ​= 1

Z = 108 / 1 × 96500

= 0.0011 gram

Thus, 0.0011 gram is the mass of Sliver deposited at the Cathode during the electrolysis of Nitrate (AgNO₃) Solution.

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Your question is incomplete, most probably your question was

Calculate the mass of Sliver deposited at the Cathode during the electrolysis of Nitrate (AgNO3) Solution,use a current of 0.10 ampere for 10 minutes.

Answer:

Filtration

Explanation:

FILTRATION = A technique that uses a porous barrier to separate a solid from a liquid.

The volume of 5.50 moles of CO2 at STP is 120.02 liters.

To calculate the volume of 5.50 moles of CO2 at standard temperature and pressure (STP), we need to use the ideal gas law:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

At STP, the pressure is 1 atmosphere (atm) and the temperature is 273.15 Kelvin (0 degrees Celsius). The gas constant is 0.08206 L•atm/mol•K.

So we can plug in the values and solve for V:

V = nRT/P = (5.50 mol)(0.08206 L•atm/mol•K)(273.15 K)/(1 atm) = 120.02 L

Therefore, the volume of 5.50 moles of CO2 at STP is 120.02 liters.

Standard temperature and pressure (STP) is a set of standard conditions used for measuring and comparing the properties of gases. STP is defined as a temperature of 273.15 Kelvin (0 degrees Celsius) and a pressure of 1 atmosphere (atm). These standard conditions allow scientists to compare the behavior of gases under the same set of conditions, making it easier to compare and contrast the properties of different gases.

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The number of moles is 123.2 moles

To find the volume of a substance from its number of moles, you will need to know its molar volume, which is the volume occupied by one mole of a substance. The molar volume can vary depending on the temperature and pressure, so you will need to specify these conditions.

The formula to calculate the volume of a substance from its number of moles is:

Volume = Number of moles x Molar volume

We know that;

1 mole occupies 22.4 L

5.5 moles occupies 5.5 moles  * 22.4 L/1 mole

= 123.2 moles

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PV = nRT is the equation used in this experiment's calculations to find the molar volume of an ideal gas.

Ideal gas is a theoretical gas composed of a set of randomly-moving, non-interacting point particles that obey certain mathematical equations. It is assumed that the particles of an ideal gas have no volume, no inter-particle forces, and that the pressure, volume, and temperature are related by the ideal gas law. Ideal gas behaviour is an approximation of the behaviour of real gases under many conditions, and is widely used in the field of thermodynamics and statistical mechanics.

This equation states that the product of pressure and volume is equal to the number of moles of the gas multiplied by the gas constant and the temperature of the gas.

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Complete Question

which of the following equations is used in this experiment's calculations to find the molar volume of an ideal gas? group of answer choices
A) PV = nRT
B) V = nRT/P
C) Both A and B
D) None to these

As the wind slows, silt is deposited because the wind has less energy.

Deposition in rivers and streams. A stream or river begins to deposit silt when it begins to slow down. In steep terrain, larger sediments fall, but smaller sediments can still be carried. As the slope gets less steep, smaller sediments are dropped.

Sediment that has been eroded is deposited in a new location when the speed of the wind or water slows. Fertile land is produced as a result of the sedimentation process.

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The reaction would proceed with a rate four times faster than at 460 K at a temperature of 1840 K (1567°C).

Temperature is a measure of the amount of thermal energy present in a system. It is expressed in units of energy, usually degrees Celsius (°C) or degrees Fahrenheit (°F). Temperature is an important physical property of matter as it is directly related to the average kinetic energy of the particles that make up the system. Temperature can be affected by a variety of factors, including pressure, concentration, type of material, and radiation.

The rate of a reaction is typically proportional to the temperature, so the rate at a temperature four times higher than 460 K would be four times faster. Therefore, the reaction would proceed with a rate four times faster than at 460 K at a temperature of 1840 K (1567°C).

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Answer:

We can solve this problem using the equilibrium expression and the stoichiometry of the reaction.

The equilibrium constant expression for the reaction is:

Keq = [Fe][CO2]/[FeO][CO]

Since the amount of Fe present is in excess, we can assume that its concentration remains essentially constant, and we can treat the reaction as if it were taking place between CO gas and solid FeO.

Let's start by writing the initial concentrations of CO and CO2 in the container before they reach equilibrium. We know that CO2 is injected at a pressure of 9.00 bar, so its initial concentration is:

[CO2] = 9.00 bar

Since there is no CO gas initially present, [CO] = 0.

The reaction stoichiometry tells us that for every mole of CO that reacts, one mole of CO2 is produced. Therefore, if x is the amount (in moles) of CO that reacts to reach equilibrium, the concentrations at equilibrium will be:

[CO2] = 9.00 bar + x bar

[CO] = x bar

At equilibrium, the equilibrium constant expression can be used to solve for x:

Keq = [Fe][CO2]/[FeO][CO]

0.90 = [Fe](9.00 bar + x bar)/[FeO](x bar)

We can simplify this expression by assuming that the amount of FeO converted to Fe and CO2 is small compared to the initial amount of FeO, and hence the amount of FeO left at equilibrium is approximately equal to the initial amount of FeO. Therefore, we can cancel out [FeO] from the above equation:

0.90 = [Fe](9.00 bar + x bar)/x

Solving for x, we get:

x = [Fe] * 9.00 bar / (0.90 + [Fe])

Now we can substitute the value of x into the equilibrium concentrations:

[CO2] = 9.00 bar + x bar

[CO] = x bar

We can also use the ideal gas law to relate the pressure of CO to its concentration:

P = nRT/V

where P is the pressure, n is the number of moles, R is the gas constant, T is the temperature, and V is the volume. Since the volume is not given, we can assume that it remains constant throughout the experiment and hence cancel it out from the equations. Therefore, the pressure of CO and CO2 at equilibrium will be:

[CO2] = 9.00 bar + x bar = 9.00 bar + ([Fe] * 9.00 bar / (0.90 + [Fe])) bar

[CO] = x bar = ([Fe] * 9.00 bar / (0.90 + [Fe])) bar

We can simplify this further by multiplying and dividing by 0.90:

[CO2] = (9.00 bar * (0.90 + [Fe]) + 9.00 bar * [Fe]) / (0.90 + [Fe]) = (8.10 bar + 9.00 bar * [Fe]) / (0.90 + [Fe])

[CO] = (9.00 bar * [Fe]) / (0.90 + [Fe])

Therefore, the partial pressure of CO at equilibrium is (9.00 bar * [Fe]) / (0.90 + [Fe]) bar, where [Fe] is the concentration of Fe in moles/liter. The units of the concentration depend on the volume of the container, which is not given.

Answer:

Socialism is another word for a planned economy

Explanation:

true or false

A Class A burette is a type of laboratory glassware used for precise volumetric measurements of liquids.

This burette is a graded glass tube with a glass tip at one end. It is utilized to dispense liquids in predetermined quantities. Most experiments requiring titration use a burette.

It is typically made of borosilicate glass and has a long, narrow, cylindrical shape with a stopcock at the bottom for dispensing the liquid. The burette is usually graduated in milliliters (mL) with the smallest graduation being 0.1 mL.

Class A burettes are manufactured and tested according to strict standards set by organizations such as the National Institute of Standards and Technology (NIST) in the United States, and the International Organization for Standardization (ISO) globally.

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Answer:

The concentration of hydrogen ions in a solution can be found by measuring the pH of the solution using a pH meter or pH paper, and then using the following equation:

[H+] = 10^(-pH)

where [H+] is the concentration of hydrogen ions in moles per liter (M) and pH is the negative logarithm of the hydrogen ion concentration.

Alternatively, if you know the concentration of a strong acid or base in the solution, you can calculate the concentration of hydrogen ions using the concentration of the acid or base and the dissociation constant (Ka or Kb) for the acid or base. For example, for a strong acid, the concentration of hydrogen ions is equal to the concentration of the acid, while for a strong base, the concentration of hydroxide ions is equal to the concentration of the base.

One weakly bound intermediate is formed between the oxygen atom of O3 and one of the nitrogen atoms of NO, and another weakly bonded is formed between the oxygen atom of O3 and the nitrogen atom of NO.

The bond between nitrogen and oxygen in NO is partially broken, while the bond between the two oxygen atoms in O3 is also partially broken. The bonds between nitrogen and oxygen in NO2 and between the two oxygen atoms in O2 are partially formed.

Nitric oxide and ozone then easily combine to form nitrogen dioxide and oxygen. No net ozone gain occurs as a result of the technique mentioned above. Concentrations are higher in the troposphere than can be explained by these processes alone.

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As the quantum numbers depend on the number of energy levels in an atom there are 2 quantum numbers for helium owing to it's 2 electrons.

Electrons present in an atom revolve in different orbits which are stationary states and are also called as energy levels. The energy levels are numbered as integers which are also called as principal quantum numbers.

Energy of the stationary state is given as E= -R

1/n² where R

is the Rydberg's constant. When an electron is excited, and it moves from lower to higher energy levels there is absorption of energy, while when it moves from higher energy level to lower energy level it radiates or gives out energy in the form of radiation.

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Answer:

if u are talking Abt H2O then the shape is vent shaped and angle between both oxygen atoms is 104.5°

Explanation:

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