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Choose the one alternative that best completes the statement or answers the question. The value of ΔS° for the catalytic hydrogenation of acetylene to ethene, C2H2 (g) + H2 (g) → C2H4 (g) is __________ J/K. A) +18.6 B) -112.0 C) -18.6 D) +112.0 E) +550.8