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Topic: Pure Substance  (Read 3400 times)

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Offline BreakingBad20

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Pure Substance
« on: May 09, 2012, 05:15:13 AM »
For a pure substance ____________.

A. its Gibbs energy always decreases with the temperature increase at constant pressure.

B. its Gibbs energy always decrease with the the pressure increases at constant temperature.

C. its Gibbs energy always increases when the substance changes from solid to liquid or from liquid to vapour.

D. its Gibbs energy always decreases when the substance changes from vapour to liquid or from liquid to solid.

E its Gibbs energy remains unchanged in a reversible phase change process.
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Offline BreakingBad20

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Re: Pure Substance
« Reply #1 on: May 09, 2012, 05:19:13 AM »
Is it C?
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Offline sjb

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Re: Pure Substance
« Reply #2 on: May 09, 2012, 05:34:26 AM »
Quote from: BreakingBad20 on May 09, 2012, 05:19:13 AM
Is it C?

Well, if it is C, why can it not be D as well? Is there only one correct answer?
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