How much \( \mathrm{NaNO}_{3} \) must be weighed (in gram) out to m...

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How much \( \mathrm{NaNO}_{3} \) must be weighed (in gram) out to make \( 50 \mathrm{ml} \) of an aqueous solution containing 70
\( \mathrm{P} \) \( \mathrm{mg} \) of \( \mathrm{Na}^{+} \)per \( \mathrm{mL} \) ?

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