A compound that is composed of carbon, hydrogen, and oxygen contains 70.6% C, 5.9% H, and 23.5% O by mass. The molecular weight of the compound is 136 amu. What is the molecular formula? A) C₈H₈O₂ B) C₄H₄O C) C₅H₆O₂ D) C₉H₁₂O E) C₈H₄O

Question

Quizplus · Accepted Answer

The empirical formula is C₄H₄O, with an empirical formula mass of 68 amu. The molecular weight is 136 amu, which is twice the empirical formula mass, so the molecular formula is C₈H₈O₂.

A Compound That Is Composed of Carbon, Hydrogen, and Oxygen