Question #f1e48

1 Answer
Oct 16, 2017

25 g of Na_2SO_4 is required.

Explanation:

C % = ("mass of solute") /("mass of solute"+"mass of solvent")

Let, rarr mass of solute (Na_2SO_4) = x
rarr mass of solvent (water)= 100g

C %= x/(x+100)*100%=20%

Hence the equation becomes:

x=(x+100)*0.2

x=0.2x+20

0.8x=20

x=20/0.8

x=25g. (Answer).

Hope it Helps:)