Empirical and Molecular Formulas

What's the empirical formula of a molecule containing 65.5% carbon, 5.5% hydrogen, and 29% oxygen?

• CHO

• C₅H₅O₂

• C₅H₅O

• C₃H₃O

What is the empirical formula of a that contains 9.8 grams of nitrogen, 0.7 grams of hydrogen, and 33.6 grams of oxygen.

• NHO₂

• NHO₃

• N₂H₂O₄

• NHO

A compound has an empirical formula of C₂OH₄ and a molar mass of 88 grams per mole. Write the molecular formula for this compound.

• C₄O₂H₈

• C₂OH₄

• COH

• C₆O₄H₁₆

Norepinephrine contains 56.8% Carbon, 6.5 % Hydrogen, 28.4% Oxygen, and 8.3% Nitrogen. It's molar mass is 169 g/mol. What is the molecular formula of this compound?

• CHON

• C₇H₁₁O₃N

• C₈H₁₁ON

• C₈H₁₁O₃N

A sugar has a chemical composition of 40% carbon, 6.6% hydrogen, and 53.3% oxygen. The molar mass is 180 g/mol. What is the molecular formula of this compound.

• CH₂O

• C₂H₄O₂

• C₄H₈O₄

• C₆H₁₂O₆