Determine the number of moles of air present in 1.35 l at 750 torr and 17.0°c. ideal gas law formula: pv = nrt(r = 62.396 l•torr/mol•k) which equation should you use? p equals startfraction n r t over v endfraction. n equals startfraction r t over p v endfraction. n equals startfraction p v over r t endfraction.

Answer:

Single atoms of elements are not molecules.

Explanation:

A single oxygen, O, is not a molecule. When oxygen bonds to itself (e.g., O2, O3) or to another element (e.g., carbon dioxide or CO2), molecules are formed

Based on the data provided, the mass of the object is inversely proportional to acceleration and directly proportional to the time taken to cover the distance.

Given that the force applied on an object is constant, the acceleration of the object is inversely proportional to the mass of the object.

According to the Newton's second law of motion, the acceleration of an object is inversely proportional to the mass of the object and directly proportional to the force and takes place in the direction of the applied force.

Based on the data provided, the more mass the car has, the more time it takes to complete the distance.

Therefore, it can be concluded that the mass of the object is inversely proportional to acceleration and directly proportional to the time taken to cover the distance.

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Answer:

3.0 atm

Explanation:

got it right on edge after guessing 2 times

The resulting pressure of the gas after decreasing the initial volume is 3 atm.

According to the Boyle's Law at constant temperature, pressure of the gas is inversely proportional to the volume of the gas:

P ∝ 1/V

For the given question required equation is:

P₁V₁ = P₂V₂, where

P₁ = initial pressure = 1.5 atm

V₁ = initial volume = 2 L

P₂ = final pressure = ?

V₂ = final volume = 1 L

On putting all these values on the above equation, we get

P₂ = (1.5)(2) / (1) = 3atm

Hence required pressure is 3 atm.

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Answer:

The sum of the kinetic energies and potential energies of all of the molecules in a substance is called the thermal energy of the substance.

Answer:

Arsenic (33As) has 33 known isotopes and at least 10 isomers.

Germanium (Ge) has properties that are similar to silicon.

2Na + 2H2O → 2NaOH + H2

The balanced equation

Answer:

Mendeleev left some gaps in his periodic table because he believed that in future more elements will be discovered.

Explanation:

"Mendeleev left gaps in his table to place elements not known at the time. By looking at the chemical properties and physical properties of the elements next to a gap, he could also predict the properties of these undiscovered elements."

Sand has a lower heat capacity hence it heats up easily and looses heat easily. On the other hand, water has a higher heat capacity and looses heat more slowly hence it remains warm at night.

The transfer of heat refers to the movement of heat from one body to another. We should note that sand has a low specific heat capacity hence it is rapidly heated up in the day and looses heat quickly at night.

On the other hand, water has a high specific heat capacity hence it heat up slowly and also does not loose heat easily even when the surrounding temperature is much colder. As such, there is an extreme temperature difference between day and night in a desert during clear weather and the water in a swimming pool in the desert tends to remain warm even when the outside temperature drops greatly at night.

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We can confirm that the energy is being used for a biological process to remove waste known as excretion.

In biology, excretion is a metabolic process in which organisms discard waste and other by-products of metabolism. This process is essential for organisms to maintain homeostasis.

Therefore, we can confirm that energy is being used for a biological process to remove waste known as excretion.

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Answer:

Hydrogen

Explanation:

Hydrogen can never be central atom despite its low electronegativity

Answer:

hydrogen is the first in periodic table

An electric motor works by converting electrical energy to mechanical energy in order to create motion.

For example,Force is generated within the motor through the interaction between a magnetic field and winding alternating (AC) or direct (DC) current.

This works because…

Answer : When an electric current flows through the wire in the electromagnet, a magnetic field is produced in the coil.

[tex]\:\mathsf{Hope\:this\:helps\:you!}[/tex]

Answer:

when an electric current flows through the wire in the electromagnet , a magnetic field is produced in the coil .

Explanation:

Considering the ideal gas law,  there are 279.42 moles of acetylene in the tank.

Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of gases:

P×V = n×R×T

In this case, you know:

Replacing in the ideal gas law:

17.4192 atm× 390 L = n×0.082 [tex]\frac{atmL}{molK}[/tex]× 296.5 K

Solving:

[tex]n=\frac{17.4192 atmx 390 L}{0.082 \frac{atmL}{molK}x296.5 L}[/tex]

n= 279.42 moles

Finally, there are 279.42 moles of acetylene in the tank.

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Since iron is more reactive than copper, when steel wopl is placed in a solution of copper (II) sulfate solution into a small beaker, it dissolves and copper metal is produced.

A displacement reaction is one in which a more reactive element displaces another from its compound.

Reactive metals displace less reactive metals from their solutions.

Iron is a more reactive metal than copper and will displace copper from a solution of its salt.

Therefore, when steel wool is placed in a solution of copper (II) sulfate solution into a small beaker, the iron dissolves and copper metal is produced.

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Answer:

that's because

Explanation:

as far as my knowledge is concerned

HCl(g) + H2O ⇄ H3O+ (aq) + Cl– (aq)

or, more simply (and truer to the original theory):

HCl(g) ⇄ H+ (aq) + Cl– (aq) or HCl(aq)

The volume of the 0.15 M LiOH solution required to react with 50 mL of 0.4 M HCOOH to the equivalence point is 133.3 mL

HCOOH + LiOH —> HCOOLi + H₂O

From the balanced equation above,

The mole ratio of the acid, HCOOH (nA) = 1

The mole ratio of the base, LiOH (nB) = 1

MaVa / MbVb = nA / nB

(0.4 × 50) / (0.15 × Vb) = 1

20 / (0.15 × Vb) = 1

Cross multiply

0.15 × Vb = 20

Divide both side by 0.15

Vb = 20 / 0.15

Vb = 133.3 mL

Thus, the volume of the LiOH solution needed is 133.3 mL

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Answer:

Phosphorus

Explanation:

Actually that's red Phosphorus

Answer:

Option B. ( Phosphorus)

Explanation:

Here, we want to select the option which is the main component present in the striking surface of a matchbox

The correct choice here is phosphorus

Red phosphorus which is an allotrope of phosphorus finds use in this particular case. It is the main chemical component present in the striking surface of a matchbox.

Hope this helps!

If you have any queries please ask.

Answer:

sulphuric acid and nitric acid

Explanation:

The acids that should be stored in plastic containers rather than in glass ones are hydrofluoric acid, phosphoric acid, sulfuric acid, etc.

Acids are those solutions that are sour in taste and have lower pH to 7.

Hydrofluoric acid is highly corrosive, made up of hydrogen and fluorine.

Phosphoric acid is an important oxygen of phosphorus.

Thus, the acids that should be stored in plastic containers rather than in glass ones are hydrofluoric acid, phosphoric acid, sulfuric acid, etc.

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There are 1.56 moles of solute present in a 2300 mL solution of 0.68M MgSO4.

The number of moles of a substance can be calculated by using the following formula:

molarity = no. of moles / volume

According to this question, a volume of 2300 mL solution is contained in 0.68 M MgSO4. The number of moles is calculated as follows:

no of moles = 0.68M × 2.3

no. of moles = 1.56

Therefore, there are 1.56 moles of solute present in a 2300 mL solution of 0.68M MgSO4.

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The thermochemical equation for the combustion of butane is:

C₄H₁₀(g) + 6.5 O₂(g) ⇒ 4 CO₂(g) + 5 H₂O(g)   ΔH = -2877.5 kJ

It informs us of the entalphy of the reaction and it includes the states of aggregation.

A thermochemical equation is a balanced stoichiometric chemical equation that includes the enthalpy change, ΔH.

C₄H₁₀ + 6.5 O₂ ⇒ 4 CO₂ + 5 H₂O

To the previous equation, we will add the enthalpy change and the states of agregation.

C₄H₁₀(g) + 6.5 O₂(g) ⇒ 4 CO₂(g) + 5 H₂O(g)   ΔH = -2877.5 kJ

The thermochemical equation for the combustion of butane is:

C₄H₁₀(g) + 6.5 O₂(g) ⇒ 4 CO₂(g) + 5 H₂O(g)   ΔH = -2877.5 kJ

It informs us of the entalphy of the reaction and it includes the states of aggregation.

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Thermohaline circulation that occur in the ocean part that flows across sea surface help to supply heat to polar regions.

The thermohaline circulation refer to a section and region of the ocean circulation which is majorly driven by heat gradient and freshwater that flows across the sea surface and also from the mixture of heat and salt that occur at the inside part of the ocean.

Therefore, Thermohaline circulation help to supply heat to polar regions.

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The partial pressure is the pressure exerted by a single gas in a volume of the mixture. The partial pressure of dihydrogen is 737.5 mmHg.

According to Dalton's law, the sum of partial pressure of non-reacting gases gives the total pressure of the system.

Given,

Total pressure = 755.0 mmHg

The partial pressure of water = 17.5 mmHg

The partial pressure of dihydrogen = ?

The partial pressure of dihydrogen is calculated as:

[tex]\begin{aligned}\rm p_{total} &= \rm p_{H_{2}O} + p_{H_{2}}\\\\755.0 &=\rm 17.5 + p_{H_{2}}\\\\&= 737.5 \;\rm mmHg\end{aligned}[/tex]

Therefore, the partial pressure of dihydrogen is 737.5 mmHg.

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Answer:

Explanation:

Answer:

The first agrument.

Explanation:

Because only heat can be transfered. Thats why if you put something hot in a refridgerator the heat energy will go off in the fridge and powers the cold energy. Im pretty sure this is right this is what my teachers tought me so i hope they right

The structure of the alkyl bromides used in a malonic ester synthesis of ethyl 2-methyl-4-pentenoate are as drawn in the attached image.

The malonic ester synthesis is a chemical reaction characterized by the alkylation of diethyl malonate or a similar ester of malonic acid at the carbon alpha (directly adjacent) to both carbonyl groups, and subsequently converted to a substituted acetic acid.

Hence, it follows from the structure of Ethyl 2-methyl-4-pentenoate that the alkyl bromides used are Ethyl bromide and methyl bromide.

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The structure of alkyl bromide that would be used in a malonic ester synthesis of ethyl 2-methyl-4-pentenoate are ethyl bromide and methyl bromide.

When halogens such as Br, Cl, I, attched to the sp3 carbon atom of alkyl group, they called alkyl halides.

Here, bromide is attached to an alkyl group.

Ethyl bromide and methyl bromide are the alkyl halides used in synthesis of ethyl 2-methyl-4-pentenoate

Thus, ethyl bromide and methyl bromide are the alkyl bromides.

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Answer:

yay well done good job keep going

Ca is the correct answer. Maybe

The jumper's potential energy at a height of 1524 meters above the ground is equal to 836,371.2Joules.

Given the following data:

Mathematically, potential energy is given by this formula:

[tex]P.E = mgh[/tex]

Where:

Substituting the given parameters into the formula, we have;

[tex]P.E = 56 \times 9.8 \times 1524[/tex]

P.E = 836,371.2Joules.

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Answer:

We use the following formula as given below Use the formula below to find the lone pair on the oxygen atom of the SO3 molecule. L.P (O) = V.E (O) – N.A (S-O) Lone pair on the terminal oxygen atom in SO3 = L.P (O)

Explanation: