If 17.8 grams of #KOH# dissolve in enough water to make a 198-gram solution, what is the concentration in percent by mass?

1 Answer
Ernest Z.
May 25, 2016

The concentration of #"KOH"# is 8.99 % by mass.

Explanation:

The formula to use is

#color(blue)(|bar(ul(color(white)(a/a) "% by mass" = "mass of component"/"total mass of sample" × 100 %color(white)(a/a)|)))" "#

For your solution,

#"% by mass" = (17.8 color(red)(cancel(color(black)("g"))))/(198 color(red)(cancel(color(black)("g")))) × 100 % = 8.99 %#

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