   Chapter 12, Problem 12CQ

Chapter
Section
Textbook Problem

Objects A and B with TA > TB are placed in thermal contact and come to equilibrium. (a) For which object does the entropy increase? (b) For which object does the entropy decrease? (c) Which object has the greater magnitude of entropy change?

(a)

To determine
For which object does the entropy increase.

Explanation

Entropy is a thermodynamic quantity that defines the degree of disorder and randomness of a system. At a constant temperature between two equilibrium states, the change in entropy is given by,

ΔS=QrT

• Qr is the energy exchanged during a reversible

(b)

To determine
For which object does the entropy decrease.

(c)

To determine
The object with the greater magnitude of entropy change.

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