• 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.
• 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 & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter5: Principles Of Chemical Reactivity: Energy And Chemical Reactions
Section: Chapter Questions
Problem 60PS: The Romans used calcium oxide, CaO, to produce a strong mortar to build stone structures. Calcium...
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The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
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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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