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r Given the standard enthalpy changes for the following two reactions: (1) 4C(s)+5H2(g)C4H10(g) H=125.6kJ (2) C2H2(g)2C(s)+ H2 (g) H=226.7kJ what is the standard enthalpy change

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Given the standard enthalpy changes for the following two reactions: (1) 4C(s)+5H2(g)C4H10(g) H=125.6kJ (2) C2H2(g)2C(s)+ H2 (g) H=226.7kJ what is the standard enthalpy change for the reaction: (3) 2C2H2(g)+3H2(g) C4H10(g)H=

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