For the process 2SO2(g) + O2(g) --> 2SO3(g),

ΔS = –187.9 J/K and ΔH = –198.4 kJ at 297.0 K are known.

What is the entropy of this reaction? Use ΔG = ΔH – TΔS

–187.9 J/K

Explanation:

The equation that relates the three quantities is:

where

is the Gibbs free energy

is the change in enthalpy of the reaction

T is the absolute temperature

is the change in entropy

In this reaction we have:

ΔS = –187.9 J/K

ΔH = –198.4 kJ = -198,400 J

T = 297.0 K

So the Gibbs free energy is

However, here we are asked to say what is the entropy of the reaction, which is therefore

ΔS = –187.9 J/K

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