Question Detail
Question
What is the mass percent composition of fluorine in haloethane (C₂HBrClF)?
Correct Answer
Option A is the correct answer.
Detailed Explanation
Molar mass of C₂HBrClF = (2×12.01) + 1.01 + 79.90 + 35.45 + 19.00 = 24.02 + 1.01 + 79.90 + 35.45 + 19.00 = 159.38 g/mol. Mass percent of F = (19.00 / 159.38) × 100% = 11.92%. This does not match the provided answer of 28.86%. For 28.86% F, the compound would need a much lower molar mass, suggesting a different compound or an error in the question. The key indicates A is correct.
Hint
Mass percent = (mass of element in one mole / molar mass of compound) × 100%.