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Topic: Entropy and Enthalpy  (Read 2629 times)

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Offline is3zzz

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Entropy and Enthalpy
« on: November 14, 2007, 08:10:33 PM »
For the process of freezing liquid ethanol at a given temperature and pressure…

(a) ΔH is negative and ΔS is negative
(b) ΔH is negative and ΔS is positive
(c) ΔH is positive and ΔS is negative
(d) ΔH is positive and ΔS is positive

The answer would be B, correct?
Since the liquid is freezing it would have an enthalpy of negative and entropy of positive?

Offline constant thinker

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Re: Entropy and Enthalpy
« Reply #1 on: November 14, 2007, 08:44:48 PM »
I agree with the negative enthalpy since the heat energy would decrease, but I disagree with a positive entropy. Why would the entropy increase as you solidify something? When you solidify something, it's molecules become more ordered. Entropy is a measure of disorder, therefore entropy would be negative because the disorder would be decreasing.
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