# Molar mass

> The molar mass of a substance is the sum of the atomic masses in its formula, in grams per mole.

> [ar-EG] الـ molar mass بتاعة أي مادة هي مجموع الـ atomic masses اللي في الـ formula بتاعتها، ووحدتها grams per mole.

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

## Builds on

- Atomic number and mass number
- Valency and writing chemical formulas


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