Please give me the answer to this question

Dear Student, 6 moles of Cl- react with 1 mole of dichromate. Moles of Cl- = 0.1 M*25 mL = 2.5 millimoles. Moles of dichromate = 2.5/6 = 0.417 millimoles. Molarity of potassium dichromate = 0.417 millimole/25 mL = 0.0167 M. Regards