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Assignment help 854

An unknown amount of a compound with a molecular mass of 287.55 g/mol is dissolved in a 10-mL volumetric flask. A 1.00-mL aliquot of this solution is transferred to a 25-mL volumetric flask and enough water is added to dilute to the mark. The absorbance of this diluted solution at 329 nm is 0.535 in a 1.000-cm cuvette. The molar absorptivity for this compound at 329 nm is ?329 = 6185 M-1 cm-1.

(a) What is the concentration of the compound in the cuvette?

(b) What is the concentration of the compound in the 10-mL flask?

(c) How many milligrams of compound were used to make the 10-mL solution?


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