Chemical energy is released or absorbed from reactions in various forms. The mos

Question

Chemical energy is released or absorbed from reactions in various forms. The most easily measurable form of energy comes in the form of heat, or enthalpy. The enthalpy of a reaction can be calculated from the heats of formation of the substances involved in the reaction: ?H?rxn=? np?H?f(products)?? nr?H?f(reactants) where n represents the stoichiometric coefficients.

Calculate the standard enthalpy change for the reaction
2A+B?2C+2D
Use the following data:

Please, show me

Explanation / Answer

2A+B?2C+2D

?H?f Rxn(kJ/mol)=2?H?f(C) + 2?H?f(D)-2?H?f(A)-?H?f(B)

?H?f Rxn(kJ/mol)=2(197)+2(-483)-2(-239)- (-413)=319kJ/mol

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