Question

Density of a gas is found to be 5.46 dm${}^3$ at 27 ${}^{\circ }C$ at 2 bar pressure. What will be its density at STP?

Answer 1

The expression for density is $d=\frac{PM}{RT}$.

For a given gas, R and M are constant.

$d\propto P/T$

$d^{\prime }=\frac{d{P}^{\prime }T}{P{T}^{\prime }}=\frac{5.46\times 1\times 300}{2\times 273}=3.0gd{m}^{-3}$