MDCAT Chemistry MCQ #3949

A heterocyclic compound, Pyridine (C5H5N), is analyzed. What is the mass percentage of the heteroatom in this molecule? (C=12, H=1, N=14)

MDCAT Chemistry MCQ #3949

  1. Question 1

    Q1. A heterocyclic compound, Pyridine (C5H5N), is analyzed. What is the mass percentage of the heteroatom in this molecule? (C=12, H=1, N=14)

    • A) 14.0%
    • B) 21.5%
    • C) 12.6%
    • D) 17.7%

    Answer: 17.7%

    Explanation: Nitrogen (14g) divided by the total molar mass (79g). 14% is wrong, using an incorrect total molecular weight.