How many molecules are present in one gram of hydrogen? (Value $\times 10^{23}$)

The number of molecules present in $1$ liter of water is: (Density of water = $1 \ g/mL$) (in $N_A$)

What is the number of moles of sulfur atoms present in $n$ mole molecules of mustard gas?

How many atoms are contained in $5.6 \ L$ of oxygen gas at $STP$?

Which of the following contains the maximum number of atoms?

There are $6.02 \times 10^{22}$ molecules each of $N_2$,$O_2$,and $H_2$ which are mixed together at $760 \ mm$ and $273 \ K$. The mass of the mixture in grams is: