In Example 13-2, we were unable to conclude by inspection whether r S for the reaction

In Example 13-2, we were unable to conclude by inspection whether Δ_rS° for the reaction CO(g) + H₂O(g) → CO₂(g) + H₂(g) should be positive or negative. Use data from Appendix D to obtain Δ_rS° at 298 K.

Example 13-2

Predict whether each of the following processes involves an increase or a decrease in entropy or whether the outcome is uncertain.

(a) The decomposition of ammonium nitrate (a fertilizer and a highly explosive compound):

(b) The conversion of SO₂ to SO₃ (a key step in the manufacture of sulfuric acid):

(c) The extraction of sucrose from cane sugar juice:

(d) The “water gas shift” reaction (involved in the gasification of coal):

Transcribed Image Text:

2 NH4NO3(s) 2 N₂(g) + 4H₂0(g) + O₂(g).