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Balance the redox equation below and identify the coefficients X, Y and Z in order: XNa2HAsO3 + YNaBrO3 + ZHCl → NaBr + H3AsO4 + NaCl

1. 2, 1, 2
2. 2, 1, 3
3. 3, 1, 6
4. 3, 1, 4

Correct answer: 3, 1, 6

Solution

Balanced: 3 Na2HAsO3 + NaBrO3 + 6 HCl -> NaBr + 3 H3AsO4 + 6 NaCl, so X=3, Y=1, Z=6. The stored 2,1,2 doesn't balance.

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