Solution of task 120 of Chemistry Book Shimanovich 2003

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120. Calculate the change in entropy for the reactions occurring according to the equations:
2CH4 (r) = C2H2 (g) + 3H2 (g)
N2 (g) + 3H2 (g) = 2NH3 (g)
C (graphite) + O2 (r) = CO2 (r)
Why in these reactions Sо298> 0; <0; ~ 0?

Answer: 220.21 J / K; -198.26 J / K; 2.93 J / K.

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