Interpretation: The molar masses of given gases A, B and C should be calculated and must be identified as ammonia,
Concept Introduction: A factor that uses one set of units to change it to another set of units is said to be a conversion factor.
Answer to Problem 31LC
The molar masses of given gases A, B and C is 28.0 g/mol, 64.1 g/mol and 16.0 g/mol respectively.
Gas A represents nitrogen,
Explanation of Solution
Given:
The density of gases A, B and C at STP are 1.25 g/L, 2.86 g/L and 0.714 g/L respectively.
The molar volume of any compound at STP is 22.4 L for 1 mol of the compound.
Now, using the value of density of the given gases and molar volume at STP, the molar mass of the gases can be calculated.
The required conversion factor is:
On substituting the value of density and solving:
For gas A:
For gas B:
For gas C:
The molar masses of:
ammonia,
sulfur dioxide,
chlorine,
nitrogen,
methane,
On comparing the values of molar masses, it can be concluded that gas A represents nitrogen,
Chapter 10 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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