🤓 Based on our data, we think this question is relevant for Professor Kobko-Litskevitch's class at HUNTER.

Step 1

$\overline{){\mathbf{\%}}{\mathbf{}}{\mathbf{mass}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}\frac{\mathbf{mass}\mathbf{}\mathbf{solute}}{\mathbf{mass}\mathbf{}\mathbf{solution}}{\mathbf{\times}}{\mathbf{100}}}\phantom{\rule{0ex}{0ex}}\frac{\mathbf{\%}\mathbf{}\mathbf{mass}}{\mathbf{100}}\mathbf{=}\mathbf{}\frac{\mathbf{mass}\mathbf{}\mathbf{solute}}{\mathbf{mass}\mathbf{}\mathbf{solution}}\phantom{\rule{0ex}{0ex}}\mathbf{mass}\mathbf{}\mathbf{solute}\mathbf{}\mathbf{=}\mathbf{}\mathbf{(}\mathbf{mass}\mathbf{}\mathbf{solution}\mathbf{)}\left(\frac{\%\mathrm{mass}}{100}\right)\phantom{\rule{0ex}{0ex}}\mathbf{mass}\mathbf{}\mathbf{NaF}\mathbf{}\mathbf{=}\mathbf{}(34.2g)\left(\frac{45.5}{100}\right)\phantom{\rule{0ex}{0ex}}\mathbf{mass}\mathbf{}\mathbf{NaF}\mathbf{}\mathbf{=}\mathbf{}\mathbf{(}\mathbf{34}\mathbf{.}\mathbf{2}\mathbf{}\mathbf{g}\mathbf{)}(0.455)$

**mass NaF = 15.561 g**

How many moles of NaF are in 34.2 grams of a 45.5% by mass NaF solution?

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Based on our data, we think this problem is relevant for Professor Kobko-Litskevitch's class at HUNTER.