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Date November 2013 Marks available 1 Reference code 13N.1.hl.TZ0.18
Level HL Paper 1 Time zone TZ0
Command term Determine Question number 18 Adapted from N/A

Question

Which processes are predicted to have a positive entropy change, \(\Delta S\)?

I.     \({{\text{I}}_2}{\text{(g)}} \to {{\text{I}}_2}{\text{(s)}}\)

II.     \({\text{4N}}{{\text{H}}_3}{\text{(g)}} + {\text{5}}{{\text{O}}_2}{\text{(g)}} \to {\text{4NO(g)}} + {\text{6}}{{\text{H}}_2}{\text{O(g)}}\)

III.     \({\text{C}}{{\text{H}}_3}{\text{OH(l)}} \to {\text{C}}{{\text{H}}_3}{\text{OH(g)}}\)

A.     I and II only

B.     I and III only

C.     II and III only

D.     I, II and III

Markscheme

C

Examiners report

[N/A]

Syllabus sections

Additional higher level (AHL) » Topic 15: Energetics/thermochemistry » 15.2 Entropy and spontaneity
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