Question #c8464

1 Answer
Jul 27, 2016

Answer:

#"10. g"#

Explanation:

You can go from moles of sodium hydroxide, #"NaOH"#, to grams of sodium hydroxide by using a conversion factor called molar mass.

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 #"39.997 g mol"^(-1)#, which implies that one mole of sodium hydroxide has a mass of #"39.997 g"#.

You can thus use the molar mass of sodium hydroxide to calculate how many grams you'd get in #0.25# moles of this compound

#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.