You can go from moles of sodium hydroxide,
The molar mass tells you the mass of exactly one mole of a given substance. In this case, sodium hydroxide has a molar mass of
You can thus use the molar mass of sodium hydroxide to calculate how many grams you'd get in
#0.25 color(red)(cancel(color(black)("moles NaOH"))) * "39.997 g"/(1color(red)(cancel(color(black)("mole NaOH")))) = color(green)(|bar(ul(color(white)(a/a)color(black)("10. g")color(white)(a/a)|)))#
The answer is rounded to two sig figs, the number of sig figs you have for the number of moles of sodium hydroxide.