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: deltaH degree_rxn = sigma n_p deltaH degree_f (products) - sigma n_r deltaH degree_f (reactants) where n represents the stoichiometric coefficients. Calculate the standard enthalpy change for the reaction 2A + B 2C + 2D Express your answer to three significant figures and include the appropriate units.

Explanation / Answer

HRxn = Hproducts - Hreaction = 2*223 + 2*-475 - (2*-229 + -423) = 377 kJ/mol

Note that you are correct, the system must be incorrect

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