Question #fa590

1 Answer
Mar 28, 2017

Answer:

#"0.927 g KCl"#

Explanation:

A solution's percent concentration by mass is supposed to let you know how many grams of solute are present for every #"100 g"# of solution.

In this case, a #color(blue)(1.67)color(darkorange)(%)# by mass potassium chloride solution will contain #color(blue)("1.67 g")# of potassium chloride, the solute, for every #color(darkorange)("100 g")# of solution.

Since solutions are homogeneous mixtures, i.e. the have the same composition throughout, you can use the percent concentration by mass as a conversion factor to determine the mass of solute present in your sample

#55.491 color(red)(cancel(color(black)("g solution"))) * "1.67 g KCl"/(100color(red)(cancel(color(black)("g solution")))) = color(darkgreen)(ul(color(black)("0.927 g KCl")))#

The answer is rounded to three sig figs, the number of sig figs you have for the solution's percent concentration.