Molar Mass & Percent Comp

Calculate the molar mass of Ba(C₂H₃O₂)₂

• 255.3 g/mol

• 237.3 g/mol

• 228.3 g/mol

• 196.3 g/mol

What are the units in molar mass?

• grams
• moles
• moles/gram
• grams/mole

The mass % of H in methane (CH₄) is:

• 75%

• 92%

• 25%

• 4%

• 6%

What is the general equation for calculating percent composition?

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

Find the percent composition of Cu₂S?

• %Cu= 67.987 %S= 32.013

• %Cu= 79.854   %S= 20.145

• %Cu= 35.946   %S= 64.054