Pad 1:46 PM D UVU Login Servic × \'MyLab and Mast: × \' D Cours MasteringChemis
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Pad 1:46 PM D UVU Login Servic × 'MyLab and Mast: × ' D Cours MasteringChemis × https/session.masteringchemistry.com/myct/itemvie.. HW1 Chemical Energy previous 19 of 24 |next s Chemical Energy Chemical energy is released or absorbed fromm 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 reacion: Affr. _ r,,AH, (products)- n,AH, (reactants) Part A Calculate the standard enthalpy change for the reaction Use the following data: Substance /) 271 375 219 Express your answer to three significant figures and include the appropriate units 11. | Value Units My Answers Give Up Part B This question will be shown after you complete previous question(s)Explanation / Answer
we have:
Hof(A) = -271.0 KJ/mol
Hof(B) = -375.0 KJ/mol
Hof(C) = 219.0 KJ/mol
Hof(D) = -511.0 KJ/mol
we have the Balanced chemical equation as:
2 A + B ---> 2 C + 2 D
deltaHo rxn = 2*Hof(C) + 2*Hof(D) - 2*Hof( A) - 1*Hof(B)
deltaHo rxn = 2*(219.0) + 2*(-511.0) - 2*(-271.0) - 1*(-375.0)
deltaHo rxn = 333 KJ
Answer: 333 KJ
Feel free to comment below if you have any doubts or if this answer do not work. I will edit it if you let me know
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