What is the weight of $3.01 \times 10^{23}$ molecules of ammonia in grams?

Mass of $0.1 \ mol$ of methane is (in $g$)

If Avogadro number $N_A$ is changed from $6.022 \times 10^{23} \ mol^{-1}$ to $6.022 \times 10^{20} \ mol^{-1},$ this would change

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

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 number of water molecules present in a drop of water (volume $0.0018 \ mL$) at room temperature is