Question

# Apply the Free Energy equation to identify whether reactions with the following values of delta H...

Apply the Free Energy equation to identify whether reactions with the following values of delta H and Delta S are spontaneous or nonspontaneous and whether they are exothermic or endothermic:

a. delta H = -128 kJ; delta S = 35 J/K at 500k

b. delta H = +67kJ; delta S= -140 J/K at 250k

c. delta H = +75 kJ; delta S = 95J/K at 800k

ΔH = -ve for exothermic reaction

ΔH = +ve for endothermic reaction

ΔG =-ve for spontaneous reaction

ΔG = +ve for non-spontaneous reaction

a.

ΔH = -ve (exothermic reaction)

ΔG = ΔH - T x ΔS

ΔG = (-128 kJ) - (500 x 0.035) = -128 - 17.5 = - 145.5 kJ (spontaneous reaction)

b.

ΔH = +ve (endothermic reaction)

ΔG = (+67 kJ) - (250 x - 0.14) = 67 + 35 = + 102 kJ (non-spontaneous reaction)

c.

ΔH = +ve (endothermic reaction)

ΔG = (+75 kJ) - (800 x - 0.095) = 75 + 76 = + 151 kJ (non-spontaneous reaction)

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