Molar Mass

Introduction to Moles and Calculating Molar Mass

Moley Moley Moley

What is a mole?

A mole is simply a unit of measurement, like a dozen, or a bushel, or a boatload.

Multiple Choice

What is Avogadro's Number?

• 6.0 x10^23

• 6.0x10^24

• 1023 x 10^6

• 8675309

Avogadro's Number

A mole of something means 6.02x10²³ of that something.

So a mole of pick up trucks is 6.02x10²³ pick up trucks

Multiple Choice

How many atoms are in 2 moles of water?

HINT: Remember mole is just a unit of measurement

• 1.204x10²⁴

• 6.02x10²³

• 12.04x10²³

• 12.04x10²⁴

Molar Mass

The molar mass, also known as molecular weight, is the sum of the total mass in grams of all the atoms that make up a mole of a particular molecule. 

The unit used to measure grams per mole. (g/mol) THIS IS IMPORTANT!

In order to do this successfully you will need two things:

A periodic table and a calculator

Multiple Choice

Calculate the Molar Mass for CaCl

• 75.53 mol/g

• 75.53 g/mol

• 35.45 g/mol

• 40.08 g/mol

Open Ended

Calculate the Molar Mass for hydrogen peroxide: H₂O₂

Multiple Choice

Calculate the molar mass of Na₂(SO₄)

• 44

• 58

• 142

• 180