Percent Composition and Molar Mass

What is on the top of the percent composition formula?

• total molar mass of just the element

• molar mass of the whole compound

• atomic structure

• electron configuration

What is on the bottom of the percent composition equation?

• molar mass of just the element

• molar mass of the whole compound

• atomic structure

• electron configuration

How do you calculate the molar mass of water?

• subtract the molar mass of oxygen from the hydrogens

• divide the molar mass of oxygen by the two hydrogens

• Add the molar masses of the two hydrogens and one oxygen

• multiply the molar mass of hydrogen and oxygen

What is the molar mass of water?

• 39.42g/mol

• 2.02 g/mol

• 16.00 g/mol

• 18.02g/mol

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What is the percent by mass of hydrogen in water?

• 18.02%

• 11.2%

• 2.02%

• 13.7%

What is the molar mass of FeCl₃?

• 162.20g/mol

• 55.85g/mol

• 35.45g/mol

• 18.02g/mol

What is the percent by mass of iron in FeCl₃?

• 25.67%

• 50%

• 34.43%

• 12.46%

How many carbons are in C₆H₁₀O₄

• 1

• 6

• 10

• 4

What is the molar mass of C₆H₁₀O₄

• 14.37g/mol

• 187.93g/mol

• 18.02g/mol

• 146.2 g/mol