An aqueous solution of \( \mathrm{NaOH} \) is \( 20 \% \) mass by m...

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An aqueous solution of \( \mathrm{NaOH} \) is \( 20 \% \) mass by mass.
Find the mass of \( \mathrm{NaOH} \) is \( 200 \mathrm{~g} \) of solution.
(A) \( 40 g \)
(B) \( 60 g \)
\( \mathrm{P} \)
(C) \( 20 g \)
(D) \( 80 \mathrm{~g} \)
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