For a Galvanic Cell That Uses the Following Two Half-Reactions

Multiple Choice

For a galvanic cell that uses the following two half-reactions,
Cr₂O₇^2-(aq) + 14 H⁺(aq) + 6 e^- → 2 Cr³⁺(aq) + 7 H₂O(l)
Pb(s) → Pb²⁺(aq) + 2 e^-
How many moles of Pb(s) are oxidized by three mol es of Cr₂O₇^2-?

A) 3
B) 6
C) 9
D) 18