Question

CaCO3(s)→CaO(s)+CO2(g)ΔH=+180KJ If entropies of limestone, lime and carbon dioxide are 93, 39 and 213J/mol/K. Then ΔStotal in JK−1 at 300 K is

Answer 1

∆S for the given reaction is 159 J/K

Entropy of a system refers to randomness in system.

Entropy or ∆S can be calculated by the formula -

∆S= S(products) - S(reactants

S(products) = 39+213

S(products) = 252 J/K

S(reactants) = 93 J/K

Entropy according to formula is -

∆S = 252-93

∆S = 159 J/K.