How many g of \( \mathrm{KCl} \) would have to be dissolved in \( 60 \mathrm{~g} \mathrm{H}_{2} ...

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How many g of \( \mathrm{KCl} \) would have to be dissolved in \( 60 \mathrm{~g} \mathrm{H}_{2} \mathrm{O} \) to give \( 20 \% \) by mass of solution?
(A) \( 15 \mathrm{~g} \)
(B) \( 1.5 \mathrm{~g} \)
(C) \( 11.5 \mathrm{~g} \)
(D) \( 31.5 \mathrm{~g} \)
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