You dissolve a compound with a molecular mass of 272.05 in a 10-mL volumetric fl

Question

You dissolve a compound with a molecular mass of 272.05 in a 10-mL volumetric flask. You remove a 1.00-mL aliquot, place it in a 25-mL volumetric flask and dilute it to the mark. The absorbance of this diluted solution at 325 nm was 0.498 in a 1.000-cm cuvet. The molar absorptivity for this compound at 325 nm is %u03B5325 = 5629 M%u20131 cm%u20131.

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

(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?

Explanation / Answer

a)0.280M

b)7.008 M

c)19.06 gms = 19065 milli grams

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