Question

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

• A. $22.4 \,L$ nitrogen gas at STP
• B. $500\, mL$ of $2.00 \,M\, NH _3$
• C. $1.00 \,mol$ of $NH _4 \,Cl$
• D. $6.02 \times 10^{23}$ molecules of $NO _2$

Answer 1

Answer: (A)

a. $22.4 \,L \,N _2$ gas at $STP =1 \,mol\, N 2$
$=N_0$ molecules of $N _2$
$=2 N_0$ atoms of $N$
b. $\frac{500 \times 2}{1000}=1 \,mol$ of $NH _3$
$=N_0$ molecules of $NH _3$
$=N_0$ atoms of $N$
c. $1 \,mol $ of $NH _4 \,Cl =N_0$ atoms of $N$
d. $6.02 \times 10^{23} NO _2$ molecules $=6.02 \times 10^{23}$ atoms of $N$