Molar mass is the weight in grams of one mole of a chemical substance.

## How to calculate the molar mass of a single element (eg.hydrogen)?

**The molar mass for an element is the sum of atomic masses, expressed as g/mol.**

**Molar mass of hydrogen = 1.008 g/mol**

## How to calculate molar mass of a compound (eg. water)?

**The molar mass for a compound can be calculated using the sum of the atomic masses of the constituent atoms, expressed as g/mol.**

Molar mass of water

Formula: **H _{2}O**

**2(1.008) + 15.999 = 18.015 g/mol**

## How to calculate the molar mass of sucrose?

Formula:** C _{12}H_{22}O_{11}**

We will use a table to show how to calculate the molar mass of sucrose:

Elements | Symbol | Atomic Mass (amu) | Molar Mass (g/mol) | #number of atoms |

Hydrogen | H | 1.008 | 1.008 | 22 |

Carbon | C | 12.01 | 12.01 | 12 |

Oxygen | O | 16.00 | 16.00 | 11 |

The molar mass of sucrose

= [22(1.008) + 12(12.01) + 11(16.00)] g/mol

= 342.30 g/mol