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What is the entropy change for the following chemical reaction at 25°C? C2H2(g) + 2H2(g) → C2H6(g) a) -102.0 J/mol•K b) 159.3 J/mol•K c) 290.0 J/mol•K d) -232.7 J/mol•K What is the enthalpy change for the chemical reaction in question 20? a) -142.05 kJ/mol b) -538.14 kJ/mol c) -311.41 kJ/mol d) 311.41 kJ/mol