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(D) According to Avogadro's Law,at constant temperature and pressure,equal volumes of gases contain an equal number of moles $(n)$.Since $n = \frac{m}

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$C < B < A$

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(D) According to Avogadro's Law,at constant temperature and pressure,equal volumes of gases contain an equal number of moles $(n)$.Since $n = \frac{m}{M}$,the mass $(m)$ is directly proportional to the molar mass $(M)$ of the gas $(m = n 	imes M)$.The molar masses are: $M(O_2) = 32 \ g/mol$,$M(Ne) = 20 \ g/mol$,and $M(CH_4) = 16 \ g/mol$.Therefore,the order of increasing mass is $M(CH_4) < M(Ne) < M(O_2)$,which corresponds to $C < B < A$.

Containers $A, B$,and $C$ of equal volume contain oxygen,neon,and methane gases respectively at the same temperature and pressure. Which of the following is the correct order of their increasing mass?

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