167. Calculate the change in entropy for reactions proceeding according to the equations, and explain the sign of the change in entropy:
a) 2SO2(g) O2(g) = 2SO3(g);
b) 2HCl(g) = H2(g) Cl2(g);
c) 2CO2(g) = 2CO(g) O2(g).
Explain the sign of entropy change.
Answer: a) -187.8 J/K; b) 20.2 J/K; c) 172.67 J/K.

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