Percent Composition and Molar Mass

What is the percentage of oxygen in carbon dioxide? (CO2)

• 27.3%

• 72.7%

• 30%

• 70%

What is the molar mass of water (H2O)?

• 18.02g/mol

• 17.01g/mol

• 16g/mol

• 1.01g/mol

Tags

NGSS.HS-PS1-7

How many moles of Ca do you have if you have 2 g of Ca?

• 0.05 mol Ca

• 80.16 mol Ca

• 20.01 mol Ca

What is equal to 1 mole? (multiple answers)

• molar mass of any compound

• molar mass of any single element

Find the percent composition of Cu₂S?

• %Cu= 67.987 %S= 32.013

• %Cu= 79.854   %S= 20.145

• %Cu= 35.946   %S= 64.054