
Interpretation: Whether 8.0 g of He or 40.0 g of argon gas more atoms needs to be determined.
Concept Introduction:
In 1 mol of any substance there are

Answer to Problem 5E
, 8.0 g of He gas has more
Explanation of Solution
The mass of helium is 8.0 g and that of argon is 40.0 g. To calculate the number of atoms, the number of moles of each gas needs to be calculated first.
The number of moles can be calculated using the following formula:
Here, m is mass and M is molar mass.
The molar mass of He and Ar gas is 4 g/mol and 40 g/mol respectively. Thus, number of moles can be calculated as follows:
Since, in 1 mol there are
Similarly,
Since, in 1 mol there are
Therefore, 8.0 g of He gas has more number of atoms than 40 g of Ar gas.
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