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First you have to find the overall charge of the C2H3O2. Hydrogen always has to have a +1 charge, and oxygen generally gets a -2 charge. then use the x for the unknown and multiply each charge by the number of the substance.

ex. 2(x) [for the carbon] + 3(+1) [for the hydrogen] + 2(-2) [for the oxygen]= overall charge of the molecule. then find x.

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