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# What is the change in enthalpy (?H) for a chemical ISBN: 9780321809247 1

## Solution for problem 20E Chapter 6

Chemistry: A Molecular Approach | 3rd Edition

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Problem 20E

What is the change in enthalpy (ΔH) for a chemical reaction? How is ΔH different from ΔE?

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Solution: The distance between two adjacent crests or troughs is called wavelength. It is denoted by the greek letter lambda() and is generally expressed in terms of Angstrom units(A ) [1 A = 10 -10m] On the other hand, the number of waves which pass through a given point in one second is known as the frequency. It is denoted by the greek letter nu() and is generally expressed in -1 terms of Hertz(Hz) [1 Hz = 1 sec ] If c is the velocity of light, the the relation between wavelength, frequency and velocity of light is given by: c = x ------(1) Step1: a) Given, wavelength of the radiation = 0.86 nm -9 -9 = 0.86 x 10 m [1 nm = 10 m] -10 = 8.6 x 10 m Velocity of light, c = 3 x 10 m/sec8 Substituting the values in equation (1), we get, 8 -10 frequency() = ( 3 x 10 m/sec) / (8.6 x 10 m) = 0.349 x 10 sec . -1 = 3.49 x 10 sec . -1 17 -1 Thus, frequency of the radiation is...

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##### ISBN: 9780321809247

The answer to “What is the change in enthalpy (?H) for a chemical reaction? How is ?H different from ?E?” is broken down into a number of easy to follow steps, and 17 words. Since the solution to 20E from 6 chapter was answered, more than 420 students have viewed the full step-by-step answer. The full step-by-step solution to problem: 20E from chapter: 6 was answered by , our top Chemistry solution expert on 02/22/17, 04:35PM. This textbook survival guide was created for the textbook: Chemistry: A Molecular Approach, edition: 3. Chemistry: A Molecular Approach was written by and is associated to the ISBN: 9780321809247. This full solution covers the following key subjects: radiation, part, wavelength, electromagnetic, frequency. This expansive textbook survival guide covers 82 chapters, and 9464 solutions.

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