Answer
$10.\%\,(m/m)\,CaCl_{2}\,solution.$
Work Step by Step
$\text{Mass percent(m/m)}=\frac{\text{Mass of solute(g)}}{\text{Mass of solution(g)}}\times100\%$
$=\frac{8.0\,g}{80.0\,g}\times100\%$
$=10.\%$
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