What is the volume occupied by $16 \ g$ methane gas at $STP$ (in $cm^3$)?

$2 \ g$ of oxygen contains a number of atoms equal to that in:

The number of electrons in a mole of hydrogen molecule is

What is the number of atoms present in $2.24 \ dm^3$ of $NH_3$ $(g)$ at $STP$?

In a flask, the weight ratio of $CH_{4(g)}$ and $SO_{2(g)}$ at $298 \ K$ and $1 \ bar$ is $1:2$. The ratio of the number of molecules of $SO_{2(g)}$ and $CH_{4(g)}$ is

The volume of a gas in a discharge tube at $STP$ is $1.12 \times 10^{-7} \ mL$. What is the number of molecules of the gas in the tube?