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Explain how the value of ?H for a reaction changes upon

Chemistry: A Molecular Approach | 3rd Edition | ISBN: 9780321809247 | Authors: Nivaldo J. Tro ISBN: 9780321809247 1

Solution for problem 25E Chapter 6

Chemistry: A Molecular Approach | 3rd Edition

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Chemistry: A Molecular Approach | 3rd Edition | ISBN: 9780321809247 | Authors: Nivaldo J. Tro

Chemistry: A Molecular Approach | 3rd Edition

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Problem 25E

Explain how the value of ΔH for a reaction changes upon each operation:

a. multiplying the reaction by a factor.

b. reversing the reaction.

Why do these relationships hold?

Step-by-Step Solution:
Step 1 of 3

Solution: According to Planck’s quantum theory of radiation, the amount of energy associated with a quantum(in case of light, the quantum of energy is often called photon) of radiation is proportional to the frequency of light, E = h ---(1), where h is a universal constant called Planck’s constant. is the frequency and E is the energy of a photon. Or, E = hc/ -------(2), where, is the wavelength of light and c is the velocity. Step1: a) Given, frequency of the light = 2.94 x 10 s 14 -1 Planck's constant, h = 6.626 x 10 -34J.s Substituting the values in equation (1), we get, E = (6.626 x 10 -34J.s) x (2.94 x 10 s )4 -1 = 19.48 x 10 -20J -19 = 1.948 x 10 J. -19 Thus, energy of one photon of the radiation is 1.948 x 10 J. Step2:...

Step 2 of 3

Chapter 6, Problem 25E is Solved
Step 3 of 3

Textbook: Chemistry: A Molecular Approach
Edition: 3
Author: Nivaldo J. Tro
ISBN: 9780321809247

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Explain how the value of ?H for a reaction changes upon

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