Chemistry dilution question, show all working please! :D?

Posted on 2016-03-04 18:57:00 in Chemistry by MICHEL

A 21 mL stock solution of a food colour having a molecular weight (molar mass) of 452.1 g mol-1 was made. 

1 mL of this stock solution was then diluted to 50 mL. 

The absorbance of the diluted solution at 475 nm wavelength was 0.392 using a 1 cm cuvette. It is known that this compound has a molar absorptivity (extinction coefficient) of 309.6 mol-1 L cm-1 at this wavelength. 

What was the mass of the food colour dissolved in the stock solution in mg?

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