MDCAT Chemistry MCQ #3936

During the combustion analysis of 0.20 g of an organic compound, 0.18 g of water was collected. What is the percentage of hydrogen in this compound?

MDCAT Chemistry MCQ #3936

  1. Question 1

    Q1. During the combustion analysis of 0.20 g of an organic compound, 0.18 g of water was collected. What is the percentage of hydrogen in this compound?

    • A) 11.1%
    • B) 9.0%
    • C) 20.1%
    • D) 5.5%

    Answer: 11.1%

    Explanation: Hydrogen mass is calculated using 2/18 of water mass. 9% is wrong because it neglects the H2 molar ratio.