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What is the standard enthalpy of formation for a compound?

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

Solution for problem 28E 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 28E

Problem 28E

What is the standard enthalpy of formation for a compound? For a pure element in its standard state?

Step-by-Step Solution:
Step 1 of 3

Solution: Here, we are going to calculate and compare the energy of the photons emitted by the given two radio stations. Step1: 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. Step2: Given, frequency of the photon = 1010 KHz = 1010 x 10 s 3 -1 [1 KHz = 1000 Hz = 1000 s ] -1 = 1.010 x 10 s 6 -1 -34 Planck's constant, h = 6.626 x 10 J.s Substituting the values in equation (1), we get, E = (6.626 x 10 J.s) x (1.010 x 10 s ) 6 -1 -28 = 6.69 x 10 J Thus, energy of one photon emitted by AM radio station is 6.69 x 10 J. -28 Step3: Given, frequency of the photon = 98.3 MHz = 98.3 x 10 s 6 -1 [1 MHz = 10 Hz = 10 s ] 6 -1 7 -1 = 9.83 x 10 s Planck's constant, h = 6.626 x 10 J.s -34 Substituting the values in equation (1), we get, -34 7 -1 E = (6.626 x 10 J.s) x (9.83 x 10 s ) = 65.13 x 10 J -27 = 6.513 x 10 J -26 -26 Thus, energy of one photon emitted by FM radio station is 6.513 x 10 J. Step4: From, equation (1), it is seen that energy of a photon is directly proportional to its frequency, i.e., greater the frequency, greater will be the energy. Thus, the energy of photon emitted by FM radio station is greater than the photon emitted by the AM radio station. ------------------

Step 2 of 3

Chapter 6, Problem 28E is Solved
Step 3 of 3

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

The answer to “What is the standard enthalpy of formation for a compound? For a pure element in its standard state?” is broken down into a number of easy to follow steps, and 18 words. The full step-by-step solution to problem: 28E from chapter: 6 was answered by , our top Chemistry solution expert on 02/22/17, 04:35PM. This full solution covers the following key subjects: broadcasts, radio, Photons, Energy, partner. This expansive textbook survival guide covers 82 chapters, and 9454 solutions. This textbook survival guide was created for the textbook: Chemistry: A Molecular Approach, edition: 3. Since the solution to 28E from 6 chapter was answered, more than 358 students have viewed the full step-by-step answer. Chemistry: A Molecular Approach was written by and is associated to the ISBN: 9780321809247.

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