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Enthalpy of Reaction
[1ΔHf(HCN (g)) + 3ΔHf(H2 (g))] - [1ΔHf(CH4 (g methane)) + 1ΔHf(NH3 (g))]
[1(135.14) + 3(0)] - [1(-74.85) + 1(-46.11)] = 256.1 kJ
256.10 kJ (endothermic)
[1ΔSf(HCN (g)) + 3ΔSf(H2 (g))] - [1ΔSf(CH4 (g methane)) + 1ΔSf(NH3 (g))]
[1(201.67) + 3(130.59)] - [1(186.27) + 1(192.34)] = 214.83 J/K
214.83 J/K (increase in entropy)
Ebbing, Darrell D. General Chemistry 3rd ed.; Houghton Mifflin Company: Boston, MA, 1990; p 224.