Determine the standard entropy change for the decomposition of one mole of solid calcium carbonate
Determine the standard entropy change for the decomposition of one mole of solid calcium carbonate, forming solid calcium oxide and carbon dioxide gas.
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This is a straight-forward application of Equation 2, followed by substitution of the Appropriate values from a table.
CaCO3(s) → CaO (s) + CO2 (g)
ΔS° = (1 mol) [ΔS° for CaO (s)] + (1 mol) [ΔS° for CO2(g)] – (1 mol)[ΔS° for CaCO3(s)]
= (1 mol) (39.8 J/mol K) + (1 mol) (213.7 J/mol K) – (1 mol) (92.9 J/mol K) = 160.6 J/K.
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