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Use the molar concentration of the 50 mL solution to calculate the moles of Cr(III) in...

Use the molar concentration of the 50 mL solution to calculate the moles of Cr(III) in the sample (around 0.5 g) taken for analysis.

Molar Concentration 0.02475 at 410nm

Molar Concentration 0.0244 at 575nm

Consider the law of mass conservation to evaluate the mass of Cr as well as the % by weight of Cr in the synthesised complex.

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Answer #1

The mass of Cr in solution is calculated:

m Cr = M * V * MM = 0.024 M * 0.05 L * 52 g / mol = 0.0624 g

The percentage of Cr is calculated:

% Cr = 0.0624 * 100 / 0.5 = 12.48%

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