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Anuraag from ANDHRA EDUCATION SOCIETY, asked a question
Subject: Chemistry , asked on 31/10/15

The molality of a solution of KCl (molar mass = 74.5 g mol−1) in water is 3 m.

What is the mass percent of KCl in the solution?

Answer me as soon as possible

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mittal.shivam13... , added an answer, on 2/11/15
13 helpful votes in Chemistry

 probably this is right......

molality = 3 , this means that there are 3 moles of KCl in 1000 g of solvent(water).

3 moles of KCl = 3*74.5 = 223.5 g of KCl 

mass of solution = 1000g + 223.5g =1223.5g

thus % of KCl=( 223.5 / 1223.5 ) x 100 =18.26 %

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Naman Rastogi From Blooming Dale School, added an answer, on 6/8/11
4 helpful votes in Chemistry

thanks

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