Question

Containers $X,Y$ and $Z$ of the equal volume contain oxygen, neon and methane respectively at the same temperature and pressure. The correct increasing order of their masses is:

• A. $X<Y<Z$
• B. $Y<Z<X$
• C. $Z<X<Y$
• D. $Z<Y<X$

Answer 1

The correct option is D $Z<Y<X$

$n=\frac{mass}{molarmass}$
mass = molar mass $\times n$ ($n$ is constant in this case as temperature , volume and pressure are constant)
mass of oxygen $=32n$
mass of neon$=19n$
mass of methane $=16n$
so increasing order is oxygen > neon > methane.