作者wei0530 (小班)
看板NDHU-Ch101
标题[课务] 普化小考８解答
时间Thu Apr 30 13:48:46 2009
1. At what temperatures will the following processes be spontaneous?
a. ΔH = -18kJ,ΔS = -60 J/K
b. ΔH = +18kJ,ΔS = -60 J/K
ΔG = ΔH - TΔS
ΔG < 0 , spontaneous
for a
-18000 - T(-60) < 0
T < 300K 时,为spontaneous
for b
18000 - T(-60) < 0
T < -300K ,所以b不会发生
2.
A. What is the third law of thermodynamics?
0 K时,完美晶体的entropy为0
B. What is the definition of standard free energy of formation?
25°C , 1atm , 1mol的物质反应时的ΔG
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