Can someone help with a Chem problem?

A 20.00mL sample of NaSO3 was titrated with 36.30mL of 0.05130M K2Cr2O7 (potium dichromate) solution in the presence of sulfuric acid. Calculate the molarity of the sodium sulfite solution. The net ionic equation is 3 SO3 2- (aq) + Cr2O72-(aq) + 8 H + (aq) -> 3 SO42- (aq) + 2 Cr3+ (aq) + 4 H2O (l)