Ca(OH)2 -------> CaSO3 (s) + H2O(l)
standard entropy of formation for CaSO3 is 101.4J/mol.K
The balanced equation between Ca(OH)2 and water is:
Ca(OH)2 -------> CaSO3 (s) + H2O(l)
The entropy of a substance can be obtained by measuring the heat required to raise the temperature a given amount, using a reversible process.
The standard molar entropy, S°, is the entropy of 1 mole of a substance in its standard state, at 1 atm of pressure.
The standard entropy of reaction is:
ΔS° = ∑ΔS° (products) - ∑ΔS° (reactants)
= [S°(CaSO3) +S°H2O] - S°[Ca(OH)2]
= [ 1 mol(101.4)+ 1 mol(69.9)] - [ 1 mol(83.4)+ 1 mol(248.5)]
ΔS° = -160.6J/K
Learn more about entropy here:
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