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Chemistry: A Molecular Approach | 3rd Edition | ISBN: 9780321809247 | Authors: Nivaldo J. Tro
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Explain how the value of ?H for a reaction changes upon

Chapter 6, Problem 25E

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QUESTION:

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?

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QUESTION:

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?

ANSWER:

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

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