Question Detail

Molar mass = (2×12)+(3×1)+35.5+(2×19)=24+3+35.5+38=100.5 g/mol. %Cl = (35.5/100.5)×100 = 35.3%? Wait, 35.5/100.5 = 0.353, so 35.3%. Not matching. Recalculate: 24+3=27, +35.5=62.5, +38=100.5. 35.5/100.5 = 0.353, 35.3%. None match. If it were C₂H₃ClF₂, maybe they used Cl=35.5 but options are off. For the similar question, the answer was 40.51% for Br. This is a different compound. Possibly the intended answer is 35.5% or 42.6%. Given rounding, 35.5% is closest. But 42.6% would be if Cl=42.6? No. The original pattern answer for Br was 40.51%. For Cl, a similar compound would give around 35.5%.