MDCAT Chemistry MCQ #2793

A compound contains 40% C, 6.67% H, and 53.3% O by mass. What is its empirical formula?

MDCAT Chemistry MCQ #2793

  1. Question 1

    Q1. A compound contains 40% C, 6.67% H, and 53.3% O by mass. What is its empirical formula?

    • A) CH₂O
    • B) C₂H₄O₂
    • C) CHO
    • D) CH₄O

    Answer: CH₂O

    Explanation: Mole ratio: 3.33 C : 6.67 H : 3.33 O → 1:2:1. Option D adds extra hydrogen.