The conversion of sulfur dioxide to sulfur trioxide is an essential step in industrial sulfuric-acid production:
2 SO₂(g) + O₂(g) → 2 SO₃(g)
Standard molar entropies at 298 K are provided below.
Species S° (J·mol⁻¹·K⁻¹)
SO₂(g) 248.1
SO₃(g) 256.7
O₂(g) 205.0
(1) Calculate the standard entropy change ΔS° for the reaction at 298 K. Report your answer in J·mol⁻¹·K⁻¹ with three significant figures.
(2) Express the value obtained in part (a) in kJ·mol⁻¹·K⁻¹, maintaining the same number of significant figures.