The mass per volume can be described as the density of the solution. The mass of salt needed to prepare 4 g/L solutions has been 2.4 grams.
The mass has been given as the weight of all the atomic elements in the sample.
The required concentration of the salt has been 4 g/L. This stated that 4 grams of the sample were in a liter of solution.
The mass required to prepare 600 mL i.e. 0.6 L sample has been:
[tex]\rm 1\;L=4\;g\\0.6\;L=0.6\;\times\;4\;g\\0.6\;L=2.4\;g[/tex]
The mass of salt required to prepare 600 mL of 4 g/L solutions has been 2.4 g. Thus, option B is correct.
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