# Calculating the Percent Composition of Hydrogen in Beryllium Hydride

## Percent Composition of Hydrogen in Beryllium Hydride (BeH2)

The **percent composition** of **hydrogen** is **18.3%**.

### What is percent composition?

The term **percent composition** refers to the percentage of a particular component in a compound. It is calculated as the **ratio** of the mass of that component to the total mass multiplied by 100.

From the **law of conservation of mass**, the total mass of beryllium hydride (BeH2) is 85.2 g.

Given that the mass of hydrogen is 15.6 g, we can calculate the percent composition of hydrogen as follows:

Percent composition of hydrogen = (15.6 g / 85.2 g) x 100% = **18.3%**