question_answer 1)

At\[0{}^\circ C\], the density of a gaseous oxide at 2 bar is the same as that of nitrogen at 5 bar. What is the molecular mass of the oxide?

Answer:

\[PM=dRT\] Gaseous oxide \[2\text{ }\times M=dRT~~~~~~~~~~~~~~~~~~~...\left( \text{i} \right)\] Nitrogen \[5\text{ }x\text{ }28\text{ }=dRT~~~~~~~~~~~~~~~~~~~~~~~~...\left( \text{ii} \right)\] From Eqns. (i) and (ii) \[2\times M=5\times 28\] \[M=70g\,mo{{l}^{-1}}\]