Chemistry

Problem

Consider the given data: 1.

\text{Cr}_2\text{O}_7^{2-} + 14\text{H}^+ + 6\text{e}^- \rightleftharpoons 2\text{Cr}^{3+} + 7\text{H}_2\text{O} \quad 1.33

\text{Cr}^{3+} + 3\text{e}^- \rightleftharpoons \text{Cr} \quad -0.74

\text{Cu}^+ + \text{e}^- \rightleftharpoons \text{Cu} \quad 0.52

\text{Cu}^{2+} + 2\text{e}^- \rightleftharpoons \text{Cu} \quad 0.34

The numerical value of the standard cell potential for the reaction

2\text{Cr}(\text{s}) + 3\text{Cu}^{2+}(\text{aq}) \rightleftharpoons 2\text{Cr}^{3+}(\text{aq}) + 3\text{Cu}(\text{s})

is (a)

-1.08\,\text{Volts}

(b)

-0.40\,\text{Volts}

(c)

1.08\,\text{Volts}

(d)

2.50\,\text{Volts}