A 3.03-g petroleum specimen was decomposed by wet ashing and subsequently diluted to 500 mL in a…

A 3.03-g petroleum specimen was decomposed by wet ashing and
subsequently diluted to 500 mL in a volumetric flask. Cobalt was determined by treating
25.00-mL aliquots of this diluted solution as follows:

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Assume that the Co(II)-ligand chelate obeys Beer’s law, and
calculate the percentage of cobalt in the original sample.

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