# What is the mass percents for the elements present in H_2SO_4?

Jan 11, 2016

Well, I know the sum of all the elemental percentages should be 100%.

#### Explanation:

Let's see, the formula weight of sulfuric acid is $98.08$ $g$. Are you clear on how I got this? Splitting this up to elemental percentages, we get:

$H$ $=$ $\frac{2 \times 1.0079 \cdot g}{98.08 \cdot g}$ $\times$ 100% $=$ 2.06%

$S$ $=$ $\frac{32.06 \cdot g}{98.08 \cdot g}$ $\times$ 100% $=$ 32.07%

$O$ $=$ $\frac{4 \times 15.99 \cdot g}{98.08 \cdot g}$ $\times$ 100% $=$ 65.25%

The sum of the percentages is near enough to 100% as required.