How do you balance the equation?

Question

MnO4^-1(aq) + C2O4^-2(aq)-> Mn^+2(aq) + CO2(g)

Answer 1

You need to learn how to do these yourself. Here is a good site that covers all the basics of redox equations. I can help get you started. Mn changes from an oxidation state of +7 on the left to +2 on the right. C changes from +3 for EACH C on the left to +4 each on the right. The FIRST thing you do is place a 2 for CO2 and use BOTH C atoms for total charge.
http://www.chemteam.info/Redox/Redox.html