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Since you dont provide temperature i assume normal conditions meaning 25 C 1 atm
Then the density of NaOH is 1.04 g/mL at 25 °C
Thus we have 18.03 * 1.04 = 18.75 grams of NaOH
The molar mass of NaOH is 40 gr / mol meaning 1 mol weighs 40 grams
Thus the number of mols will be n = 18.75 / 40 = 0.468 mols
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