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April 19, 2014

Homework Help: chemistry

Posted by Anonymous on Sunday, November 23, 2008 at 1:05am.

Identify the true statement(s) regarding the entropy of chemical substances.

a. All pure substances have a positive entropy at room temperature.
b. The dissolution of an ionic salt in water usually leads to an increase in entropy of the system (salt + water).
c. So(one mole O3(g)) > So(one mole O2(g)) at 25oC.
d. The entropy of ice at 0oC is lower than that of water at 0oC.
e. When a metallic crystal is heated, its entropy increases due to increasing atomic vibrations.

i know a, c and d are true, but im not sure about b and e

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