The mass of $112 \ cm^3$ of $CH_4$ gas at $STP$ is ............. $g$.

From $392 \, mg$ of $H_2SO_4$,$1.204 \times 10^{21}$ molecules are removed. How many moles of $H_2SO_4$ are left?

The mass of $0.1 \ mol$ of methane $(CH_4)$ is .......... $g$.

If the number of moles of $CH_4$ is equal to the number of moles of $1.24 \, g$ of $SO_2$,then the weight of $CH_4$ will be ............ $g$.

$7.0 \, g$ of $N_2$,$8.0 \, g$ of $O_2$,and $34.0 \, g$ of $NH_3$ are present in a $1 \, L$ vessel. The active masses in $mol \, L^{-1}$ are respectively:

How will you differentiate $0.50 \ mol$ $Na_2CO_3$ and $0.50 \ M$ $Na_2CO_3$?