Chemistry(Please help, thank you!!)

What is the oxidation number of sulfur (s) in NaHSO3?

I know that Na is 1 but I do not know what else to do. Please explain, thank you for your help!!

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  1. NaHSO3.
    Na is +1.
    H is +1.
    O is -2 so 3*-2 = -6
    Therefore, S must be +4?

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  2. Thank you. I understand how you got the numbers for Na and H and the -6 for O but why does S have to be +4?

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  3. 'cause the sum of every atoms's N.O of this molecule is equal to 0

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  4. The correct answer is +2

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