Molar Mass

Molar Mass - chemistry
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)?

Atomic mass of hydrogen = 1.008 AMU

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)?

Calculate the molar mass of 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: H2O

2(1.008) + 15.999 = 18.015 g/mol

How to calculate the molar mass of sucrose?

Formula: C12H22O11

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

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