kachi

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Given the following chemical reactions and their respective enthalpy changes C2H2 + 5/2 O2-------- 2CO2 +H2O -1299.6 KJmol C + 1/2 O2----------CO2 -393KJmol H2 + 1/2 O2--------H2O -285.9KJmol Calculate the Delta H for the reaction 2C + H2--------C2H2

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pls I need more explanation on this question