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Date May 2014 Marks available 1 Reference code 14M.1.hl.TZ1.17
Level HL Paper 1 Time zone TZ1
Command term Question number 17 Adapted from N/A

Question

Which reaction has the greatest increase in entropy?

A.     \({\text{2C}}{{\text{H}}_3}{\text{OH(l)}} + {\text{3}}{{\text{O}}_2}{\text{(g)}} \to {\text{2C}}{{\text{O}}_2}{\text{(g)}} + {\text{4}}{{\text{H}}_2}{\text{O(l)}}\)

B.     \({{\text{N}}_2}{\text{(g)}} + {\text{3}}{{\text{H}}_2}{\text{(g)}} \to {\text{2N}}{{\text{H}}_3}{\text{(g)}}\)

C.     \({\text{2HCl(aq)}} + {\text{MgC}}{{\text{O}}_3}{\text{(s)}} \to {\text{MgC}}{{\text{l}}_2}{\text{(aq)}} + {{\text{H}}_2}{\text{O(l)}} + {\text{C}}{{\text{O}}_2}{\text{(g)}}\)

D.     \({\text{N}}{{\text{H}}_3}{\text{(g)}} + {\text{HCl(g)}} \to {\text{N}}{{\text{H}}_4}{\text{Cl(s)}}\)

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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