Question

The mass of one oxygen molecule is:

• A. $2.656\times {10}^{-23}gm$
• B. $5.312\times {10}^{-23}gm$
• C. $1.66\times {10}^{24}gm$
• D. $32gm$

Answer 1

Answer: (B)

$5.312\times {10}^{-23}gm$

One mole contains $6.02\times {10}^{23}molecules$ of oxygen.

It weighs $32$ g.

Thus, weight of $1$ oxygen molecule is $\frac{32}{6.023\times {10}^{23}}=5.312\times {10}^{-23}gm$.

Hence, option B is correct.