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 = 16.0 g 16.0 g CH4 and 1 mole CH4 1 mole CH4 16.0 g CH4

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 1 mole acetic acid

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

Calculations with Molar Mass Grams Moles

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

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 1 mol Al 1 mol Al 27.0 g Al 3. Setup 3.00 moles Al x 27.0 g Al 1 mole Al Answer = 81.0 g Al

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 H2O2 ? g H2O2

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 1.0079) + (2 x 15.999) = 34.0138 g/mol 2. Conversion factors for H2O2 34.0138 g H2O2 or 1 mol H2O2 1 mol H2O2 34.0138 g H2O2 3. Setup 5.00 moles H2O2 x 34.0138 g H2O2 1 mole H2O2 Answer = 170.069 g H2O2

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?

Solution 1. Molar mass of Al2O3 (2 x 26.982) + (3 x 15.999) = 101.961 g/mole 2. Setup 9.45 mol Al2O3 x 1 mole Al2O3 101.961 g Al2O3 Answer = 0.0927 mole Al2O3

Grams to Moles for Elements Aluminum is often used for the structure of light-weight bicycle frames. How many moles of Al are in 126.00 g of Al? 126.00 g Al ? moles Al

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 1 mol Al 1 mol Al 27.0 g Al 3. Setup 126.00 g Al x 1 mole Al 27.0 g Al Answer = 4.66 moles Al

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 1500.00 g H2O2? 1500.00 g H2O2 ? moles H2O2

Grams to Moles for Compounds 1. Molar mass of H2O2 1 mole H2O2 = (2 x 1.0079) + (2 x 15.999) = 34.0138 g/mol 2. Conversion factors for H2O2 34.0138 g H2O2 or 1 mol H2O2 1 mol H2O2 34.0138 g H2O2 3. Setup 1500.00 g H2O2 x 1 mole H2O2 34.0138 g H2O2 Answer = 44.099 moles H2O2

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?

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 = 0.765 mole aspartame