How many grams of KCl would have to be dissol | vedclass

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(B) The formula for mass percentage is: $	ext{Mass percentage} = \frac{	ext{Mass of solute}}{	ext{Mass of solute} + 	ext{Mass of solvent}} 	imes

Vedclass · Accepted Answer

$15$

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(B) The formula for mass percentage is: $	ext{Mass percentage} = \frac{	ext{Mass of solute}}{	ext{Mass of solute} + 	ext{Mass of solvent}} 	imes 100$Let the mass of $KCl$ be $W \ g$.Given: $	ext{Mass of solvent} (H_2O) = 60 \ g$,$	ext{Percentage} = 20 \%$.Substituting the values:$\frac{W}{W + 60} 	imes 100 = 20$Divide both sides by $20$:$\frac{W}{W + 60} 	imes 5 = 1$$5W = W + 60$$4W = 60$$W = 15 \ g$

How many grams of $KCl$ would have to be dissolved in $60 \ g$ of $H_2O$ to give a $20 \%$ by weight solution?

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