Question

Which of the following contains the highest number of $N$ atoms?

• A. $22.4\text{L}$ of nitrogen gas at STP
• B. $11.2\text{L}$ of $N{H}_3$ gas at STP
• C. 1 mole of $N{H}_{4}Cl$
• D. $6.02\times {10}^{23}$ molecules of $N{O}_2$

Answer 1

The correct option is A $22.4\text{L}$ of nitrogen gas at STP

(a) $22.4\text{L}$ of $N_2$ gas at STP = 1 mole of $N_2$ = $N_A$ molecules of $N_2$ = $2N_A$ atoms of $N$

(b) $11.2\text{L}$ of $N{H}_3$ gas at STP = 0.5 mole of $N{H}_3$ = 0.5 $N_A$ atoms of $N$

(c) 1 mole of $N{H}_{4}Cl$ = $N_A$ atoms of $N$

(d) $6.02\times {10}^{23}N{O}_2$ molecules = $6.02\times {10}^{23}$ atoms of $N$= $N_A$ atoms of $N$