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

###### FREE Expert Solution

###### FREE Expert Solution

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**

###### Problem Details

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

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Mass Percent concept. You can view video lessons to learn Mass Percent Or if you need more Mass Percent practice, you can also practice Mass Percent practice problems .

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Our expert Chemistry tutor, Rae-Anne took 3 minutes to solve this problem. You can follow their steps in the video explanation above.

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