# Mass percentage of an element

> Percentage of an element = (mass of the element in one mole of the compound / molar mass of the compound) x 100.

> [ar-EG] النسبة المئوية لأي عنصر = (كتلة العنصر ده في one mole من الـ compound ÷ الـ molar mass بتاعة الـ compound) x 100.

Part of: Transition Elements (https://yaani.ai/ar/learn/chemistry/chem-s3-en.ch1)

## Builds on

- Percentages
- Molar mass


Source: https://yaani.ai/ar/concept/stoich.mass-percentage