Entropy. What is it? Prof Al, from the chemistry department at AUT, attempts to explain.
The worked problems:
1) Predict the sign of the entropy changes for the following reactions
2NaHCO₃(s) → Na₂CO₃(s) + H₂O(g) + CO₂(g)
C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(g)
2) Calculate the value of ΔS for the reaction
CO(g) + 2H2(g) → CH3OH(l) given the following standard entropies
S°(CO, g) = 197.9 J mol⁻¹ K⁻¹
S°(H2, g) = 130.6 J mol⁻¹ K⁻¹
S°(CH3OH, l) = 126.8 J mol⁻¹ K⁻¹