120. Calculate the changes in entropy for reactions proceeding according to the equations:
2CH4(g) = C2H2(g) ZH2(g)
N2(g) ZH2(g) = 2NH3(g)
C (graphite) O2 (g) = CO2 (g)
Why in these reactions 0 > ΔS0298 ≥ 0.
Answer: 220.21 J/K; -198.26 J/K; 2.93 J/K.

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