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
2(1.008) + 15.999 = 18.015 g/mol
How to calculate the molar mass of sucrose?
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|
The molar mass of sucrose
= [22(1.008) + 12(12.01) + 11(16.00)] g/mol
= 342.30 g/mol