You dissolve the sample of FD&C Red 40 (molar mass 496.4200 g/mol) in enough water to make 250.0 mL of solution. We call this the stock solution.
What is the concentration of the stock solution in terms of molarity?

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\[Molarity=\frac{ mol solute }{ volume }\]
mol solute in grams
volume in liters.

Molarity in M

so I divide the molar mass or Red 40 by 250 ml?

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