The Mole HillGRAMS TO MOLES TO MOLES TO GRAMS

Objective 5-6

SWBAT calculate molar mass and use it to convert between grams and moles.

(Yes, this is the same objective as last week)

Grams to Moles

Review: Use molar mass!How many moles of H2O do I have in

25 grams of H2O?

Moles to Grams

Review: Use molar mass!How many grams of H2O do I have in

2 moles of H2O?

Moles to Moles

We can use subscripts in chemical formulas as a conversion factor too.

For example: H2O gives us the conversion factors:

2 mol H = 1 mol H2O1 mol O = 1 mol H2O

Example

How many moles of hydrogen are in 2 moles of H2O?

Example

How many moles of water can I make with 25 moles of hydrogen?

Practice

How many moles of oxygen are in 3 moles of SO4?

How many moles of SO4 can I make with 10 moles of sulfur?

The Mole Hill

The Mole Hill

Note: You can NOT convert straight from grams to grams.

You MUST go:grams moles moles grams

Example

How many moles of H2O are in 20 grams of H2O?

How many moles of H are in 20 grams of H2O?

Example

How many grams of H are in 20 grams of H2O?

How many grams of O are in 45 grams of H2SO4?

Practice

How many grams of H are in 40 grams of H2SO4?

How many grams of H2SO4 are in 100 grams of S?