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2NaClO2---> 2NaCl + 3O2

if 3.85 grams of NaClO3 react, how many moles of O2 are created?

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You have a typo somewhere. NaClO2 in the equation; NaClO3 in the problem.

mols NaClOx = grams/molar mass
Convert mols NaClOx to mols O2 using the coefficients in the balanced equation.

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