A 179 mL solution of a copper complex with a molecular weight of 491.9 g mol-1 was made. The absorbance of the solution at 638 nm wavelength was 0.376 using a 1 cm cuvette. It is known that this copper complex has a molar absorptivity (extinction coefficient) of 324.4 M-1 cm-1 at this wavelength.What was the mass of the copper complex dissolved in the solution in mg? Report your answer to 3 significant figures.
chemistry university - DrBob222, Monday, April 15, 2013 at 3:05pm
A = ebc
A = 0.376
e = 324.4
b = 1 cm
c = unknown.
Solve for C in molarity.
mols = M x L where L = 0.179\
grams = molos x molar mass. Solve for grams and convert to mg.
chemistry university - angela, Tuesday, April 16, 2013 at 9:00am
is it 102 mg
rounded to 3 significant figures.