Ex.2.1– The reaction C3H8(g)+ 5 O2(g) → CO2(g)+ 4 H2O(g) has deltaHrxn= -2044 kJ at 25°C.
Calculate the entropy change of the surroundings.
Ex. 2.2 – The reaction CCl4(g) → C(s, graphite)+ 2 Cl2(g) has deltaH= +95.7 kJ and deltaS = +142.2 J/K at 25°C.
Calculate deltaG and determine if it is spontaneous.
Ex. 2.3 – The reaction CCl4(g) → C(s, graphite)+ 2 Cl2(g) has deltaH= +95.7 kJ and deltaS= +142.2 J/K.
Calculate the minimum temperature it will be spontaneous.
Ex. 2.4 –Calculate deltaS°for the reaction
4 NH3(g)+ 5 O2(g)→4 NO(g)+ 6 H2O(g)
Substance |
S°, J/mol×K |
NH3(g) |
192.8 |
O2(g) |
205.2 |
NO(g) |
210.8 |
H2O(g) |
188.8 |
Ex. 2.5 –Calculate deltaG°at 25°C for the reaction
CH4(g)+ 8 O2(g)→CO2(g)+ 2 H2O(g)+ 4 O3(g)
Substance |
deltaG°f, kJ/mol |
CH4(g) |
-50.5 |
O2(g) |
0.0 |
CO2(g) |
-394.4 |
H2O(g) |
-228.6 |
O3(g) |
163.2 |
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