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I believe there are 3 sig figs in the answer because at one point in the equation, there is adding/subtracting, which has different sig fig rules from multiplying/dividing. When dealing with addition/subtracting, you take the smallest number of decimal places which will be 3 sig figs, so when you divide it later to find the enthalpy of vaporization, the answer will have 3 sig figs.
It is multiplied by 1/2 because the questions says that Ron "realizes that half of his 255 g forgetfulness potion has boiled away. Therefore, you would multiply the mass by 1/2 since only half of it was converted into vapor.
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