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(34.7g/100g)*1.3g/ml=0.45
let volume of the solution be v
density=(34.7+100)/v = 1.3
134.7=1.3v
v=134.7/1.3 ml
%w/v=mass of KCl in 100 ml of solution.
134.7/1.3 ml contains 34.7 g of KCl.
100 ml contains:(100 x 34.7 x 1.3)/134.7=33.49%
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