What is equivalent gram for 5C2O4(-2)=>10CO2

Question

is it Mw/1 or Mw/2

Answer 1

Oxidation state for 10 C in C2O4^2- is 30 and in CO2 is 40 so change in electrons = 10 and that is for 5 C2O4^2-. So change per C2O4^2- is 2. Divide by 2.