1.

Calculate the standard entropy change for the following reaction (∆Hf°), given the standard entropies of COf (g), C(s), O2(g) as 213.6, 5.740 and 205 JK-1 respectively.

Answer»

C(g) + O2(g) → CO2(g) 

∆Sr° = ∑Sproducts° – Sreactants°

∆Sr° = {\(S{_{CO}{_2}}\)°} – {Sc° + \(S{_O{_2}}\)°} 

∆Sr° = 213.6 – [5.74 + 205] 

∆Sr° = 213.6 – [210.74]

∆Sr° = 2.86 JK-1.



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