The density of sulfuric acid is 1.84 g/mL. What volume of this acid will weigh 171 g?
As you know, a substance's density tells you the mass of one unit of volume of that substance.
In your case, the density of sulfuric acid is given to you in grams per milliliter,
So, you know that every
#171 color(red)(cancel(color(black)("g"))) * overbrace("1 mL"/(1.84 color(red)(cancel(color(black)("g")))))^(color(purple)("density")) = color(green)("93.0 mL")#
The answer is rounded to three sig figs.