Fe goes from +2 to +3, gaining 1. Cr goes from +6 to +3, losing 3. You need 3 Fe per Cr. Also, the K cannot simply vanish, something has to form with it.
K2Cr2O7(aq) + 6FeCl2(aq) + 14HCl(aq) → 6FeCl3(aq) + 2CrCl3(aq) + 7H2O(l) + 2KCl(aq)
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Fe goes from +2 to +3, gaining 1. Cr goes from +6 to +3, losing 3. You need 3 Fe per Cr. Also, the K cannot simply vanish, something has to form with it.
K2Cr2O7(aq) + 6FeCl2(aq) + 14HCl(aq) → 6FeCl3(aq) + 2CrCl3(aq) + 7H2O(l) + 2KCl(aq)