Chemistry

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25.0mL of an acidic 0.100 mol/L tin (II) chloride solution required an average volume of 12.7 mL of potassium dichromate solution for a complete reaction. The amount of concentration of the potassium dichromate solution is _______ mmol/L

How do you go about solving this? I think that the 5 step method is involved in finding a solution :/ Please help!! My test is tomorrow :( thanksss!!

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