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(1) 2C(s)+2H2(g)C2H4(g)H=52.3kJ (2) 2C(s)+3H2(g)C2H6(g)H=84.7kJ What is the standard enthalpy change for the following reaction? (3) C2H4(g)+H2(g)C2H6(g)H= ? Standardenthalpychange=kJ

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