49. How many g of KCl would have to be dissolved in 60 g
H2O to give 20% by wt. of solution
(1) 15 g (2) 1.5 g (3) 11.5 g (4) 31.5 g
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Explanation:
weight / weight% = weight of kcl / weight of solution ×100
let weight of kcl =w
so, 20= w/w+60×100
1/5= w/ w+60
w+ 60= 5 w
60= 4 w
w = 15 gm
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