# What is the percent by mass of oxygen in H_2SO_4?

##### 1 Answer
Mar 24, 2016

=65.3%

#### Explanation:

Molar mass of ${H}_{2} S {O}_{4} = 2 \times 1 + 32 + 4 \times 16 = 98$
so percantage of oxygen $= \frac{64}{98} \times 100 = 65.3$