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1 mole of NaOH contains 6.02 x 10^23 molecules
So 0.2 moles of NaOH contains 6.02 x 10^23 divided by 5
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The molar mass of S is 32.06 g/mol, so 4.82 g of S is equal to 0.150 mol. In the reaction of S with O2 to form SO2, 1 mol of S reacts with 1 mol of O2. Therefore, 0.150 mol of S would require 0.150 mol of O2, which is equivalent to 0.150 * 6.022 x 10^23, or 9.03 x 10^22 molecules of O2.
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