This problem is providing the mass of salt, 15 g, that is dissolved in 100 mL of water, so its concentration is required and found to be 15 % according to the following calculations:
By mass percent:
In chemistry, units of concentration in solutions are used to represent the relative amount of a solute that is dissolved in a solvent. Thus, in this case, we refer to a salt-water solution, whose concentration is calculated via:
[tex]\% m=\frac{m_{salt}}{m_{water}}*100\%[/tex]
In such a way, given the mass of salt, 15 g and volume of water, or solution, 100 mL, one obtains the following:
[tex]\% m=\frac{15g}{100g}*100\% \\\\\% m=15\%[/tex]
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