Hydrogen gas occupies a volume of `18` litres at `27^(@)C` and under a pressure of `0.92` bar. The number of moles present in the gas is :

Options

A. `0.56` mol
B. `0.67` mol
C. `0.35` mol
D. `0.87` mol

Answer

B

Explanation

According to ideal gas equation
`PV = nRT` or `n = (PV)/(RT)`
`V = 18 L, P = 0.92` bar
`T = 27+273 = 300 K`,
`R = 0.083 L "bar" K^(-1) mol^(-1)`
`n = ((0.92 "bar") xx (18 L))/((0.083 L "bar" K^(-1)) xx (300 K))`
`= 0.067` mol.