1.2.1 Avogadro number and Molar mass

What is a mole?

A very big number of atoms or molecules
called Avogadro number or NA = 6.022 x 10²³ mol^-1

Why do we use mole as a unit in chemistry?

Look at "how big are things" and the music video below to figure out the answer to this question.

What is Molar mass?

• The mass of one mole of atom. Example: 1 mole of Carbon has a mass of 12.011 g. Thus, Carbon molar mass is 12.011 g/mol
• Molar mass, M, has the units g mol-1. This is the same as g/mol

Doing calculation with mole