The mass of a sample of aluminum is $54 \ g$. The mass of the same number of magnesium atoms will be ......... $g$.

The density of water is $1 \, g/mL$. What is the volume occupied by $1$ molecule of water :-

In which case is the number of molecules of water maximum?

What is the number of molecules of $SO_2$ present in $64 \ g$ of $SO_2$?

The number of water molecules in $250\, mL$ of water is closest to $.....\, \times 10^{23}$.
[Given: density of water is $1.0\, g\, mL^{-1}$; Avogadro's number $= 6.023 \times 10^{23}$]

The number of molecules and the number of atoms present in $1 \ g$ of nitrogen are respectively .....