Question

The number of atoms present in $0.5$ mole of nitrogen is same as the atom in

• A. $12g$ of C
• B. $64g$ of S
• C. $8g$ of O
• D. $48g$ of Mg

Answer 1

Answer: (C)

$8g$ of O

Equal moles of an atom contains the equal number of particles.

1 mole has $N_A$ number of particles $(N_A=6.023\times 10^{23})$

Now, $0.5mole{N}_2\to \frac{N_A}{2}$

$\left(a\right)12gC\equiv 1moleC\equiv N_{A}particles$

$\left(b\right)64gS\equiv 2moleC\equiv {2\times N}_{A}particles$

$\left(c\right)8gO\equiv 0.5moleO\equiv \frac{N_A}{2}particles$

$\left(d\right)48gMg\equiv 2moleMg\equiv {2\times N}_{A}particles$

Hence, the correct option is $\text{C}$