1. Molar Mass Conversion Factors
Methane CH4 known as natural gas is used in gas cook tops and gas heaters. Express the molar mass of methane in the form of conversion factors.
Molar mass of CH4 = g
16.0 g CH and mole CH4
1 mole CH g CH4

2. Learning Check
Acetic acid CH3COOH is the acid in vinegar . It has a molar mass of 60.0 g/mole.
1 mole of acetic acid = ___________g_
1 mole acetic acid or g acetic acid
g acetic acid mole acetic acid

3. Solution
Acetic acid CH3COOH is the acid in vinegar . It has a molar mass of 60.0 g/mole.
1 mole of acetic acid = g acetic acid
1 mole acetic acid or g acetic acid
60.0 g acetic acid 1 mole acetic acid

4. Calculations with Molar Mass
Grams Moles

5. Moles to Grams for Elements
Aluminum is often used for the structure of light-weight bicycle frames. How many grams of Al are in 3.00 moles of Al?
3.00 moles Al ? g Al

6. Moles to Grams for Elements
1. Molar mass of Al 1 mole Al = 27.0 g Al
2. Conversion factors for Al
27.0g Al or mol Al
1 mol Al g Al
3. Setup 3.00 moles Al x g Al
1 mole Al
Answer = g Al

7. Moles to Grams for Compounds
The decomposition of hydrogen peroxide (H2O2) provides sufficient energy to launch a rocket. How many grams of H2O2 are needed for rocket launch that requires 5.00 moles H2O2?
5.00 moles H2O ? g H2O2

8. 1 mole H2O2 = (2 x 1.0079) + (2 x 15.999) = 34.0138 g/mol
Moles to Grams for Compounds
Molar mass of H2O2
1 mole H2O2 = (2 x ) + (2 x ) = g/mol
2. Conversion factors for H2O2
g H2O or mol H2O2
1 mol H2O g H2O2
3. Setup 5.00 moles H2O2 x g H2O2
1 mole H2O2
Answer = g H2O2

9. Learning Check
Aluminum satellite dishes are resistant to corrosion because the aluminum reacts with oxygen in the air to form a coating of aluminum oxide (Al2O3). This tough, resistant coating prevents any further corrosion. What is the mass of 9.45 mol of Al2O3?

10. Solution 1. Molar mass of Al2O3
(2 x ) + (3 x ) = g/mole
2. Setup
9.45 mol Al2O3 x 1 mole Al2O3
g Al2O3
Answer = mole Al2O3

11. Grams to Moles for Elements
Aluminum is often used for the structure of light-weight bicycle frames. How many moles of Al are in g of Al?
g Al ? moles Al

12. Grams to Moles for Elements
1. Molar mass of Al 1 mole Al = 27.0 g/mol Al
2. Conversion factors for Al
27.0g Al or mol Al
1 mol Al g Al
3. Setup g Al x 1 mole Al
27.0 g Al
Answer = moles Al

13. Grams to Moles for Compounds
The decomposition of hydrogen peroxide (H2O2) provides sufficient energy to launch a rocket. How many grams of H2O2 are needed for rocket launch that requires g H2O2?
g H2O ? moles H2O2

14. Grams to Moles for Compounds
1. Molar mass of H2O2
1 mole H2O2 = (2 x ) + (2 x ) = g/mol
2. Conversion factors for H2O2
g H2O or mol H2O2
1 mol H2O g H2O2
3. Setup g H2O2 x 1 mole H2O2
g H2O2
Answer = moles H2O2

15. Learning Check
The artificial sweetener aspartame (Nutri-Sweet) formula C14H18N2O5 is used to sweeten diet foods, coffee and soft drinks. How many moles of aspartame are present in 225 g of aspartame?

16. Solution 1. Molar mass of Aspartame C14H18N2O5
(14 x 12.0) + (18 x 1.01) + (2 x 14.0) + (5 x 16.0) = 294 g/mole
2. Setup
225 g aspartame x 1 mole aspartame
294 g aspartame
Answer = mole aspartame