Answered: Use the Hess’ Law to ca

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Use the Hess’ Law to calculate ∆H°(tot) for the [tot] reaction from the ∆H°’s given:

[tot] N2(g) + 3H2(g) --> 2NH3(g) ∆H°(tot) = ________? kJ

[1] 4NH3(g) + 3O2(g) --> 2N2(g) + 6H2O(g) ∆H°1 = –1268 kJ

[2] 2H2(g) + O2(g) --> 2H2O(g) ∆H°2 = –484 kJ

[tot] = ___×[1] ___×[2] add up equations [1] and [2] scaled by the factors you chose, and cancel the same formulas on both sides: ______________ --> ___________________ same as [tot] after cancelling? ___ if “Yes”, scale the enthalpies ∆H°1 and ∆H°2 by the factors you chose for their equations, and combine for the ΔH°(tot) = ___×∆H°1 ___×∆H°2 = ____kJ

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