Question

The weight of a single atom of oxygen is

• A. $5.057\times 10^{23}g$
• B. $1.556\times 10^{23}g$
• C. $2.656\times 10^{-23}g$
• D. $4.538\times 10^{-23}g$

Answer 1

Answer: (C)

Atomic wt of oxygen $=16g$
Wt of $6.02\times 10^{23}$ atoms of oxygen is $16g$
So, weight of $1$ atom $=\frac{16}{6.02\times 10^{23}}$
$=2.656\times 10^{-23}g$