Question

1 mole of $N_2$ has _____ number of atoms.

• A. 6.022 $\times$ ${10}^{23}$
• B. 3.011 $\times$ ${10}^{23}$
• C. 12.044 $\times$ ${10}^{23}$
• D. 6.022 $\times$ ${10}^{22}$

Answer 1

The correct option is C 12.044 $\times$ ${10}^{23}$

$N_2$ is a diatomic gas. Hence, the smallest unit of $N_2$ gas is a $N_2$ molecule.
∴ 1 mole of $N_2$ gas = 6.022 $\times$ ${10}^{23}$ molecules of $N_2$

Since each molecule of $N_2$ has 2 atoms, 1 mole of $N_2$ gas = 2 $\times$ 6.022 $\times$ ${10}^{23}$ atoms
= 12.044$\times$ ${10}^{23}$ atoms