Answer
$5.3\%\,(m/m)$ sucrose solution.
Work Step by Step
$\text{Mass percent(m/m)}=\frac{\text{Mass of solute(g)}}{\text{Mass of solution(g)}}\times100\%$
$=\frac{12\,g}{225\,g}\times100\%$
$=5.3\%$
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