Question

How many gram of kcl would have to be dissolve in 60 g H2o to give 40% by weight of solution?

Answer 1

15 g

As we know,

% by mass =

Mass of solution

Mass of solute

×100

20=

Mass of KCl + Mass of water

Mass of KCl×100

Let, x be the mass of KCl

20=

x+60

100x

x=15g

Therefore, mass of KCl =15 g