Chemistry Question?

Question

32. What is the minimum temperature required for the spontaneous conversion of CCl4(l) to CCl4(g) when delta H is 573 kJ/mol and delta S is 1.64 kJ/mol x K???
a. 76 degree C
b. 89 degree C
c. 189 degree C
d. 215 degree C
e. 349 degree C

Answer 1

A reaction is spontaneous if the change of the gibbs free energy due to reaction is negative:
ΔGr = ΔHr - T · ΔSr < 0
<=>
ΔHr < T · ΔSr
<=>
T > ΔHr / ΔSr = 573kJ/mol / 1.64kJ/(molK) = 349.4K = 76.25°C

a. is the correct answer

Answer 2

e. 349 degree C

Answer 3

Work out (573/1.64) - 273 and you will have your answer!