Question

answer plz.......................................................
5g of KNO3 when dissolved in 45g distilled water. it's percentage by weight (W/W%) will be :....

Answer 1

Percentage by weight (W/W%) = [(weight of solute)/weight of solution ] x 100
here , weight of solute(KNO3) = 5g
weight of solution = weight of KNO3 + weight of water = 5 + 45 = 50g
So, percentage by weight = (5/50)x100 = 100/10 = 10 ....
hence , percentage by weight (W/W%) = 10...
.... and finally .... Happy Rakshabandhan... ^_^