Question: Given the standard enthalpy changes for the following two reactions: ( 1 ) 4 C ( s ) + 5 H 2 ( g )

Given the standard enthalpy changes for the following two reactions:
(1)4C(s)+5H2(g)longrightarrowC4H10(g),H=-125.6kJ
(2)C2H4(g)longrightarrow2C(s)+2H2(g),H=-52.3kJ
what is the standard enthalpy change for the reaction:
(3)2C2H4(g)+H2(g)longrightarrowC4H10(g),H=?
Given the standard enthalpy changes for the following two reactions: (1)4C(s)+5H2(g)longrightarrowC4H10(g),H=-125.6kJ

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