Answer:

2.25 g KC

Explanation:

solution's percent concentration by mass,

% m/m

, essentially tells you how many grams of solute, which in your case is potassium chloride,

KCl

, you get per

100 g

of solution.

You're dealing with a

5.00% m/m

solution of potassium chloride, so right from the start you should be able to look at this solution and say that it contains

5.00 g

of solute for every

100 g

of solution.

So, if

100 g

of solution will contain

5.00 g

of solute, it follows that

45.0 g

of solution will contain

45.0

g solution

⋅

= 5.00% m/m



5.00 g KCl

100

g solution

=

∣

∣

∣

∣

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

a

a

2.25 g

a

a

∣

∣

−−−−−−−−−−