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Question

How many g of KCl would have to be dissolved in 60 g H2O to give 20% by mass of solution?

A
15 g
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B
1.5 g
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C
11.5 g
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D
31.5 g
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Solution

The correct option is A 15 g
As we know,
% by mass =Mass of soluteMass of solution×100
20=Mass of KCl×100Mass of KCl + Mass of water
Let, x be the mass of KCl

20=100xx+60

x=15g

Therefore, mass of KCl =15 g

Hence, the correct option is A

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