Redox Reaction in Acidic Media

Chemistry Level 1

How many water molecules per molecule of CrX2OX7X2\ce{Cr2O7^{2-}} is needed to balance the following reaction in acidic medium?

CrX2OX7X2+ClXCrX3++ClX2\ce{Cr2O7^2- + Cl^{-} -> Cr^{3+} + Cl2 }

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