DeltaH= -196.0 kJ/mol, DeltaS=125.9 J/mol •k and T is 25°C

Question

2H2O2(l) = 2H2O(l) + O2(g)

spontaneous yes or no

Answer 1

For the reaction to be spontaneous, ΔG should be negative.

And ΔG = ΔH - TΔS. Now if we substitute the values given..

ΔG = -160 + T *0.1259

ΔG = -160 + 298 x 0.1259 = -160 + 37.52

ΔG = -122 kJ/mol

Since ΔG is negative, the reaction is spontaneous.

Answer 2

Because the enthalpy is negative and entropy is positive, this reaction is spontaneous at any temperature.