Question

What is the actual mass of one molecule of $N{H}_3$?

• A. 17 g
• B. 17 amu
• C. $2.82\times 10^{-23}$ g
• D. $1.02\times 10^{-23}$ g

Answer 1

Answer: (C)

Molecular mass of $N{H}_3=17$ amu
$1u=1.66\times 10^{-24}g$
The actual mass of $N{H}_3=17\times 1.66\times 10^{-24}$
$=2.82\times 10^{-23}g$