MDCAT Chemistry MCQ #58

A sample of pure phenol is analyzed for its elemental composition. What is the percentage of carbon by mass in phenol?

MDCAT Chemistry MCQ #58

  1. Question 1

    Q1. A sample of pure phenol is analyzed for its elemental composition. What is the percentage of carbon by mass in phenol?

    • A) 50.0%
    • B) 91.4%
    • C) 64.2%
    • D) 76.6%

    Answer: 76.6%

    Explanation: Phenol (C6H6O) has M.W 94. Carbon mass is 72 (6x12). 72/94 * 100 is 76.6%. 91.4% is for benzene.