A solution is prepared by adding \( 5 \mathrm{~g} \) of a substance \( x \) to \( 18 \mathrm{~g}...

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A solution is prepared by adding \( 5 \mathrm{~g} \) of a substance \( x \) to \( 18 \mathrm{~g} \) of water. Calculate the mass percentage of the solute.
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