The number of moles and volume in $56 \ g$ of nitrogen $(N_2)$ are respectively:

The number of atoms in $0.1 \ mol$ of a triatomic gas is $(N_A = 6.02 \times 10^{23} \ mol^{-1})$

What is the number of moles of $N$ atoms and number of moles of $O$ atoms respectively present in one mole of uracil?

Which of the following substances consists of a total of $1 \ mol$ of atoms? (Molar mass of $NH_3 = 17 \ g/mol, H_2O = 18 \ g/mol, N_2 = 28 \ g/mol, CO_2 = 44 \ g/mol$)

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 $= 6.023 \times 10^{23}$]