What Is the Total Number of Moles (N)of Electrons Exchanged $\rarr$

Short Answer

What is the total number of moles (n)of electrons exchanged between the oxidizing agent and the reducing agent in the overall redox equation:
3C₂O₄^2-(aq)+ Cr₂O₇^2-(aq)+ 14H⁺(aq) $\rarr$ 6CO₂(g)+ 2Cr³⁺(aq)+ 7H₂O(l)