You would also need to know the mol of sodium. After knowing the mol, write down the reaction; Na + H20 -> NaOH + H2 Use the mol ratio, to find the amount of mol of sodium hydroxide. (Remember to balance the equation first) After you have the necessary variables, use the following formula: mass of sodium hydroxide = mol of sodium hydroxide x molar mass (relative/formula mass of sodium hydroxide) That is how you will find the mass of sodium hydroxide.
