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Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097

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BuyFindarrow_forward

Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

For each of the following pairs of substances, which substance has the greater value of S°?

a. Cgraphite(s) or Cdiamond(s)

b. C2H5OH(l) or C2H5OH(g)

c. CO2(s) or CO2(g)

Interpretation Introduction

Interpretation: The pair that has higher ΔS value is to be identified in each case.

Concept introduction: Entropy (ΔS) is the measure of degree of disorder or randomness. Increase in the randomness of the system leads to increase in the entropy (the value of entropy increases).

Explanation

Explanation

(a)

Atoms are closely packed in giant molecular structure of diamond whereas atoms are loosely packed in the layered structure of graphite. The randomness of atoms is higher in loosely packed graphite as compared to closely packed diamond.

Since, increase in the randomness of the system leads to increase in the entropy (entropy becomes higher). As a result, Cgraphite(s) has higher ΔS value.

(b)

The degree of disorder (randomness) increases during the conversation of liquid state into gaseous state.

Since, increase in the randomness of the system leads to increase in the entropy (entropy becomes higher)

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