Question

The percentage of oxygen in $NaOH$ is

• A. 16%
• B. 4%
• C. 40%
• D. 8%

Answer 1

Answer: (C)

Molecular weight of $NaOH$ is $40$

Atomic weight of oxygen is $16$

$\Rightarrow$ Percentage of oxygen $=\frac{16}{40}\times 100$

$=40\%$