MDCAT Chemistry MCQ #2810

A 100.0 g sample of CuSO₄·5H₂O loses mass upon heating. What is the mass percent of H₂O? (CuSO₄ = 159.5 g/mol, H₂O = 18.02 g/mol)

MDCAT Chemistry MCQ #2810

  1. Question 1

    Q1. A 100.0 g sample of CuSO₄·5H₂O loses mass upon heating. What is the mass percent of H₂O? (CuSO₄ = 159.5 g/mol, H₂O = 18.02 g/mol)

    • A) 36.1%
    • B) 42.1%
    • C) 32.4%
    • D) 51.3%

    Answer: 36.1%

    Explanation: [(5×18.02)/(159.5+90.1)]×100 = 36.1%. B adds 18.02 five times incorrectly.