Chemical energy is released or absorbed from reactions in various form. the most

Question

Chemical energy is released or absorbed from reactions in various form. 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: = Delta H^degree_rxn = sigma n_p Delta degree_f (products) - sigma n_r Delta H degree_f (reactants) where n represents the stoichiometric coefficients. Calculate the standard enthalpy change for the reaction Use the following data: Express your answer to three significant figures and include the appropriate units.

Explanation / Answer

2A + B --------> 2C + 2D

DH rex = DHf products - DHf reactant

             = 2*219+2*-521 -(2*-271-399)

              = 337KJ/mole >>>>>answer

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