
Concept explainers
(a)
Interpretation:
The determination of the molar mass of a gas if its density is
(a)

Explanation of Solution
The ideal gas equation is an equation that determines the relation between the pressure
The value of R in
The molar mass of a gas at STP can be determined by using the value of its density. The density
So, the molar mass of the gas can be determined by using molar volume of the gas, that is, assume
The conversion factor for temperature from Celsius to Kelvin is as follows.
For
The conversion of pressure from
For
Substitute the values in equation
The volume of the gas is, therefore,
The number of moles of the gas is equal to the ratio of the mass of the gas to the molar mass of that gas.
At STP, the number of moles of the gas is
(b)
Interpretation:
The determination of the molar mass of a gas if its density is
(b)

Explanation of Solution
Since the values of pressure and temperature are the same as those of the previous part, the volume of the gas is the same, that is,
The volume of the gas is, therefore,
The number of moles of the gas is equal to the ratio of the mass of the gas to the molar mass of that gas.
At STP, the number of moles of the gas is
(c)
Interpretation:
The determination of the molar mass of a gas if its density is
(c)

Explanation of Solution
Since the values of pressure and temperature are the same as those of the previous part, the volume of the gas is the same, that is,
The volume of the gas is, therefore,
The number of moles of the gas is equal to the ratio of the mass of the gas to the molar mass of that gas.
At STP, the number of moles of the gas is
(d)
Interpretation:
The determination of the molar mass of a gas if its density is
(d)

Explanation of Solution
Since the values of pressure and temperature are the same as those of the previous part, the volume of the gas is the same, that is,
The volume of the gas is, therefore,
The number of moles of the gas is equal to the ratio of the mass of the gas to the molar mass of that gas.
At STP, the number of moles of the gas is
(e)
Interpretation:
The determination of the molar mass of a gas if its density is
(e)

Explanation of Solution
Since the values of pressure and temperature are the same as those of the above part, the volume of the gas is the same, that is,
The volume of the gas is, therefore,
The number of moles of the gas is equal to the ratio of the mass of the gas to the molar mass of that gas.
At STP, the number of moles of the gas is
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Chapter 9 Solutions
Introduction to Chemistry
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