ConstChemical energy is released or absorbed from reactions invarious forms. The most easily measurable form of energycomes in the form of heat, or enthalpy. The enthalpy of areaction can be calculated from the heats of formation of thesubstances involved in the reaction:Part AAH = E npAH (products)-En,AH (reactants)Calculate the standard enthalpy change for the reactionwhere n represents the stoichiometric coefficients.24 +B=20 + 2DUse the following dataAH(kJ/mol)Substance-239-405203D477Express your answer to three significant figures and include the appropriate-> View Available Hint(s)nyct/itemView?assignmentProblemID-174388858AB SubstanceConstants | Periodic Tableabsorbed from reactions inmeasurable form of energyothalpy The enthalpy of athe heats of formation of thestion(kJ/mol)-239B-405203ets) - En,AH (reactants)477ometric coefficients.Express your answer to three significant figures and include the appropriate units.> View Available Hint(s)AH =VolueKnitsSubmitPart B Complete previous part(s)Vi 1:24

The enthalpy change can be calculated via subtracting that of reactants from that of products.

Answered: Calculate the standard enthalpy change…

Chemistry for Engineering Students

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Chapter9: Energy And Chemistry

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Problem 9.101PAE

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Calculate the standard enthalpy change for the reaction 2A +B=20 + 2D Use the following data: AH (kJ/mol) Substance -239 B -405 203 D -477 Express your answer to three significant figures and include the appropa