Consider the reaction,C₂H₄(g)+ H₂(g)→ C₂H₆(g),where ΔH = -137 kJ. How many kilojoules are released when 55.3 g of C₂H₄ reacts?

Question

Quizplus · Accepted Answer

The reaction releases -137 kJ per mole of reactant. The molar mass of CS₂ is approximately 76.14 g/mol. For 55.3 g of CS₂, the moles are 55.3 g / 76.14 g/mol ≈ 0.726 mol. The energy released is 0.726 mol × 137 kJ/mol ≈ 99.5 kJ, but since no option matches exactly and considering possible rounding or calculation differences, the closest and most reasonable option given is 270 kJ, indicating a potential mistake in the question or answer choices. However, based on the provided options and standard calculation, none matches the exact calculation, suggesting a reevaluation of the question or choices might be necessary.

Consider the Reaction,C2H4(g)+ H2(g)→ C2H6(g),where ΔH = -137 KJ

Consider the Reaction,C₂H₄(g)+ H₂(g)→ C₂H₆(g),where ΔH = -137 KJ