The Following Has a Potential of 0 If the Concentrations of Each of the Ions Is 1

The following has a potential of 0.34 V. $\mathrm { Cu } ^ { 2 + } ( \mathrm { aq } ) + \mathrm { H } _ { 2 } ( \mathrm {~g} ) \rightarrow 2 \mathrm { H } ^ { + } ( \mathrm { aq } ) + \mathrm { Cu } ( \mathrm { s } )$ If the concentrations of each of the ions is 1.0 M and the pressure of H₂ is 1.0 atm, then E° for the half-reaction $\mathrm { Cu } ^ { 2 + } ( \mathrm { aq } ) + 2 e ^ { - } \rightarrow \mathrm { Cu } ( \mathrm { s } )$ is _____.

A) 0.17 V
B) -0.17 V
C) 0.34 V
D) -0.34 V
E) None of these