We are asked to calculate the concentration, in m/v%, of a solution prepared from 20. g NaCl and 2.0 L of water?

Recall the formula:

$\overline{){\mathbf{}}{\mathbf{m}}{\mathbf{/}}{\mathbf{v}}{\mathbf{\%}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}\frac{\mathbf{g}\mathbf{}\mathbf{solute}}{\mathbf{mL}\mathbf{}\mathbf{solution}}{\mathbf{\times}}{\mathbf{100}}}\phantom{\rule{0ex}{0ex}}\mathbf{}\mathbf{m}\mathbf{/}\mathbf{v}\mathbf{\%}\mathbf{}\mathbf{=}\mathbf{}\frac{\mathbf{20}\mathbf{}\mathbf{g}}{(2.0\overline{)L}\times {\displaystyle \frac{1\mathrm{mL}}{{10}^{-3}\overline{)L}}})}\mathbf{\times}\mathbf{100}$

What is the concentration, in m/v%, of a solution prepared from 20. g NaCl and 2.0 L of water?

A) 5.0%

B) 1.0%

C) 0.010%

D) 10%

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