# What is the percent composition of #H_2S#?

##### 1 Answer

Apr 2, 2016

#### Explanation:

Total mass of a compound is found by adding up the mass of all the atoms. Using mass numbers from the RSC periodic table, the total mass of the compound

Percentage mass of an element in a compound is given by

where

Percentage mass of hydrogen therefore is

And, likewise, percentage mass of sulfur is