Advanced Redox Reaction Problems

So one of the questions is: "How many mL of a 0.280 M K2Cr2O7(aq) solution are needed to reduce 1.40 g of sulfur?" The equation is K2Cr2O7 + H2O + S —> SO2 + KOH + Cr2O3. And I vaguely remember needing to find a ratio and using a formula with n/v or something, but I can't remember the specifics. Help please?

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