• Part A 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: Δ.ΗΣn,Δ Η (products) -Σn, Δι Η ' (reactants) Calculate the standard enthalpy change for the reaction 2A +B 2C + 2D where n represents the stoichiometric coefficients. Use the following data: A H (k.J mol) Substance A -233 -391 181 D -477 Express your answer to three significant figures and include the appropriate units. > View Available Hint(s) O pra ? A,H° - 265 kJ Submit Previous Answers X Incorrect; Try Again; One attempt remaining Enter your answer using units of enthalpy.

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Part A
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:
Δ.ΗΣn, Δ Η' (products)-Σn, Δ Η (reactants)
Calculate the standard enthalpy change for the reaction
2A +B= 2C+2D
where n represents the stoichiometric coefficients.
Use the following data:
Af H°
(kJ mol¬1)
Substance
A
-233
-391
181
D
-477
Express your answer to three significant figures and include the appropriate units.
• View Available Hint(s)
HẢ
?
A;H° = |265
kJ
Submit
Previous Answers
X Incorrect; Try Again; One attempt remaining
Enter your answer using units of enthalpy.
Transcribed Image Text:Part A 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: Δ.ΗΣn, Δ Η' (products)-Σn, Δ Η (reactants) Calculate the standard enthalpy change for the reaction 2A +B= 2C+2D where n represents the stoichiometric coefficients. Use the following data: Af H° (kJ mol¬1) Substance A -233 -391 181 D -477 Express your answer to three significant figures and include the appropriate units. • View Available Hint(s) HẢ ? A;H° = |265 kJ Submit Previous Answers X Incorrect; Try Again; One attempt remaining Enter your answer using units of enthalpy.
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