Q. How many gram of KCL would have to be dissolved in 60 g $H_{2}O$ to give 40% by weight of solution?
A) 40 g
B) 20 g
C) 15 g
D) 10 g
Explanation
(a)
% by weight $= \frac{weight\ of\ solute}{weight\ of\ soultion} \times 100$
Or $40 = \frac{w}{(w + 60)} \times 100$
$w = 40\ g$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.