Mass percent of \( \mathrm{Na} \) in \( \mathrm{Na}_{2} \mathrm{CO}_{3} \) is \( \mathrm{P} \) (...

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Mass percent of \( \mathrm{Na} \) in \( \mathrm{Na}_{2} \mathrm{CO}_{3} \) is
\( \mathrm{P} \)
(A) \( 21.52 \% \)
(B) \( 31.20 \% \)
W.
(C) \( 38.20 \% \)
(D) \( 43.40 \% \)
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