Please help not sure? number 1 and 2 1. For spontaneously occuring natural proce
ID: 893820 • Letter: P
Question
Please help not sure? number 1 and 2
1. For spontaneously occuring natural processes in an isolated system, which of the following expressions best describes dS?
dS = w
dS > 0
dS < 0
dS = 0
E. dS = dq/T
2. All of the following statements below about entropy are true EXCEPT:
The molar entropy of vaporization of most liquids are around 85 J/(mol-K)
An irreversible process increases the entropy of the universe.
The entropy of a crystal at 0oC is zero.
Entropy is not a path function.
The net entropy of a closed cycle is zero.
A.dS = w
B.dS > 0
C.dS < 0
D.dS = 0
E. dS = dq/T
2. All of the following statements below about entropy are true EXCEPT:
A.The molar entropy of vaporization of most liquids are around 85 J/(mol-K)
B.An irreversible process increases the entropy of the universe.
C.The entropy of a crystal at 0oC is zero.
D.Entropy is not a path function.
E.The net entropy of a closed cycle is zero.
Explanation / Answer
1) For spontaneous process , always dS > 0 (because randomness indicates the spontanity) , thus the option is B.
2) According the third law of thermdynamics, entropy of perfect crystal at 0 K is zero. But in option c) it is mentioned at 0 deg C, so c) is answer.
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