For a given compound, list the decreasing order of entropy for a liquid, solid,

Question

For a given compound, list the decreasing order of entropy for a liquid, solid, and gas A) solid > gas > liquid B) solid > liquid > gas C) gas > liquid > solid D) liquid > solid > gas E) gas > solid > liquid Consider a reaction that has a positive Delta H and a positive Delta S. Which of the following statements is TRUE? A) This reaction will be nonspontaneous at all temperatures. B) This reaction will be spontaneous at all temperatures. C) This reaction will be spontaneous only at high temperatures. D) This reaction will be nonspontaneous only at high temperatures. E) It is not possible to determine without more information.

Explanation / Answer

3. C

Greater the randomness of the system, greater be the entropy. The ramdamness of gaseous system is greater than liquid, and the same of liquid is greater than solid so the correct order is gas> liquid> solid.

4. C

We know that at const. temperature and pressure

del G = del H - T del S

the reaction will sponteneous only when del G is Negative

as the del S and del H both positive, so only at high temperature the reaction will be sponteneous.

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