Problem: Calculate the standard enthalpy change for the reaction2A + B ⇌ 2C + 2DUse the following data:Express your answer to three significant figures and include the appropriate units.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:ΔH°rxn = ΣnpΔH°f(products) − ΣnrΔH°f(reactants)where n represents the stoichiometric coefficients.

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Calculate the standard enthalpy change for the reaction
2A + B ⇌ 2C + 2D

Use the following data:

Express your answer to three significant figures and include the appropriate units.


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:

ΔH°rxn = ΣnpΔH°f(products) − ΣnrΔH°f(reactants)

where n represents the stoichiometric coefficients.

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