Gibb’s Free Energy Problems

1) Based on the following values, compute ?G values for each reaction, and predict whether the reaction will occur spontaneously:

a. ?H = +125 kJ/mol b. ?H = -85.2 kJ/mol

T = 293K T = 127°C

?S = 0.0350 kJ/mol×K ?S = 0.125 kJ/mol×K

c. ?H = -275 kJ/mol

T = 500°C

?S = 0.450 kJ/mol×K

2) C(s) + O2(g) Ô CO2(g) + 393.51 kJ

Calculate ?G, if ?S for this reaction (at 25°C) is

0.0175 kj/mol×K. Will this reaction be spontaneous at

25°C?

3) CaCO3(s) + 176kJ Ô CaO(s) + CO2(g)

Calculate ?G, if ?S for this reaction (at 25°C) is 0.250

kj/mol×K. Will this reaction be spontaneous at 25°C?

4) H2O(g) Ô H2O(l) + 44.02kJ

Calculate ?G, if ?S for this reaction (at 35°C) is 0.0845

kj/mol×K. Will this reaction be spontaneous at 35°C?

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