The molar mass for a given gas which is having density of 2. 104 g/l at 303 k and 1. 31 atm is 39.90 g/mol.
Here Density ρ= 2.104 g/l
Pressure P= 1.31 atm
Temperature T=303 K
By using ideal gas equation :
[tex]PV=\frac{m}{M} RT\\\\M=\frac{m}{V} \frac{RT}{P}\\ \\M=\frac{2.104*0.082*303}{1.31} \\\\M=\frac{52.2759}{1.31\\}\\M=39.90 g/mol[/tex]
Thus the molar mass m of a gas is 39.90 g/mol.
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