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When ethene is mixed with hydrogen in the presence of a

Organic Chemistry | 8th Edition | ISBN: 9780321768414 | Authors: L.G. Wade Jr ISBN: 9780321768414 33

Solution for problem 7P Chapter 4

Organic Chemistry | 8th Edition

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Organic Chemistry | 8th Edition | ISBN: 9780321768414 | Authors: L.G. Wade Jr

Organic Chemistry | 8th Edition

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Problem 7P

When ethene is mixed with hydrogen in the presence of a platinum catalyst, hydrogen adds across the double bond to form ethane. At room temperature, the reaction goes to completion.Predict the signs of  for this reaction. Explain these signs in terms of bonding and freedom of motion.

Step-by-Step Solution:

Solution 7P

Step 1</p>

Ethane undergoes catalytic reduction in presence of hydrogen to form ethane.

The reaction is as follows:

Step 2 </p>

In the above reaction, two molecules react to give one molecule. So, the reactants have more degree of freedom than the products. Thus, the entropy change  is negative.

Since the entropyis negative, the term becomes positive.

The above reaction is much favourable. It means that the free energy change  is large negative.

The entropy is negative, and the free energy is negative. So, the enthalpy of the reaction must be negative.

Step 3 of 3

Chapter 4, Problem 7P is Solved
Textbook: Organic Chemistry
Edition: 8
Author: L.G. Wade Jr
ISBN: 9780321768414

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