Balance the net ionic equation

Question

I− + NO−
2 ! NO + I2
(in acidic solution). What is the sum of the
coefficients? Use H+ rather than H3O+ where
appropriate.
1. 13
2. 15
3. 17
4. 11
5. 19

Answer 1

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Answer 2

This is the first time I've submitted a question and I just need some help with this one.