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An electrochemical cell is constructed from the following two half-cell reactionsrnrnvo₂(aq) + 2h(aq) + e > VO² (aq) + H2O(1)rnrnPb(aq) + 2e Pb(s)rnrnE+1.00 VrnrnE-0.13 Vrnrn(a) Write a balanced equation for the overall reaction when the two half-cells are connected
Accepted Answer
The balanced equation for the overall reaction when the two half-cells are connected is:
VO₂(aq) + 2 H(aq) + Pb(s) → VO² (aq) + H2O(1) + Pb(aq)
The overall cell reaction is spontaneous because the standard cell potential is positive:
E°cell = E°red - E°oxid
E°cell = 1.00 V - (-0.13 V) = 1.13 V
The positive cell potential indicates that the reaction will proceed spontaneously in the direction written.
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