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A colored substance Z has an absorption maximum at 350 nm. A solution containing 2 mg of Z per liter had an absorbance of 0.850 using a 1 cm cell. The formula weight of Z is 148.

(a) Calculate the absorptivity of Z at 350 nm.
(b) A solution containing Z gave an absorbance of 0.450. What is the concentration of Z in this sample in ppm?

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