Determining Number of Moles Question

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In summary, in order to calculate the number of moles of acetone in the vapor phase inside a Hickman still, we first need to convert the temperature to Kelvin and the pressure to atmospheres. Then, using the ideal gas law (PV=nRT) and the given values for pressure, volume, and temperature, we can determine that there are 8.59x10-7 moles of acetone present. This calculation assumes that acetone vapor behaves as an ideal gas at the given temperature.
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predentalgirl1
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Hello. Just need this answer checked. Thanks.

If we can reasonably treat acetone vapor as an ideal gas at the Tboil =70° C and we approximate the volume of a Hickman still as ~25mL then how many moles of acetone are in the vapor phase inside the still? (PV=nRT) (R=0.0821 L*atm/mol*K) (Get conversion of P & T in right form.)

Answer:-

T= 70+273=343K
P=0.736/760=9.68x10-4atm
R=0.0821 L*atm/mol*K
V= 25x10-3L
n=no.of moles = PV/RT= 9.68x10-4atm x 25x10-3L /(0.0821 L*atm/mol*K x 343K)
= 8.59x10-7
 
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Sure
 
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Is my work/answer correct?
 
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Sure
 
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lol, yes it is correct!
 

What is a mole?

A mole is a unit of measurement in chemistry that represents the amount of a substance. It is defined as the amount of a substance that contains the same number of particles as there are atoms in 12 grams of carbon-12. This number is approximately 6.022 x 10^23, also known as Avogadro's number.

How do you determine the number of moles in a substance?

The number of moles in a substance can be determined by dividing the mass of the substance by its molar mass. The molar mass is the mass of one mole of a substance and is usually expressed in grams per mole (g/mol). This calculation is represented by the formula: number of moles = mass / molar mass.

What is the relationship between moles and molecules?

There is a direct relationship between moles and molecules. One mole of a substance contains the same number of molecules as there are in 6.022 x 10^23 atoms or molecules. This means that the number of moles is equal to the number of molecules divided by Avogadro's number.

Can the number of moles be negative?

No, the number of moles cannot be negative. Moles are a unit of measurement and cannot have a negative value. However, the number of moles can be expressed as a decimal or fraction if the mass of the substance is not a whole number.

Why is it important to determine the number of moles in a chemical reaction?

Determining the number of moles in a chemical reaction is important because it allows us to accurately measure the amounts of reactants and products involved. This information is necessary for calculating the yield of a reaction and predicting the outcome of the reaction. It also helps in determining the stoichiometric ratios between different substances in a reaction.

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