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Two reactions and their enthalpy changes are shown. 2C(s) + 2H2(g) → C2H4(g) ∆Ho = +52.2 kJ mol–1 C2H2(g) + H2(g) → C2H4(g) ∆Ho = –175.8 kJ mol–1 These data can be used to calculate the enthalpy change for the reaction shown. 2C(s) + H2(g) → C2H2(g) ∆Ho= X What...