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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 時,為spontaneous
for b
18000 - T(-60) < 0
T < -300K ,所以b不會發生
2.
A. What is the third law of thermodynamics?
0 K時,完美晶體的entropy為0
B. What is the definition of standard free energy of formation?
25°C , 1atm , 1mol的物質反應時的ΔG
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