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Date May 2009 Marks available 1 Reference code 09M.1.hl.TZ2.32
Level HL Paper 1 Time zone TZ2
Command term Apply Question number 32 Adapted from N/A

Question

What is the cell potential, in V, for the reaction that occurs when the following two half-cells are connected?

\[\begin{array}{*{20}{l}} {{\text{F}}{{\text{e}}^{2 + }}{\text{(aq)}} + {\text{2}}{{\text{e}}^ - } \rightleftharpoons {\text{Fe(s)}}}&{{E^\Theta } = - 0.44{\text{ V}}} \\ {{\text{C}}{{\text{r}}_2}{\text{O}}_7^{2 - }({\text{aq)}} + 14{{\text{H}}^ + }({\text{aq)}} + 6{{\text{e}}^ - } \rightleftharpoons 2{\text{C}}{{\text{r}}^{3 + }}{\text{(aq)}} + {\text{7}}{{\text{H}}_2}{\text{O(l)}}}&{{E^\Theta } = + 1.33{\text{ V}}} \end{array}\]

A.     +0.01

B.     +0.89

C.     +1.77

D.     +2.65

Markscheme

C

Examiners report

[N/A]

Syllabus sections

Additional higher level (AHL) » Topic 19: Redox processes » 19.1 Electrochemical cells
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