17. Solving a chemistry problem
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44. A steel sample contains 0.7% chromium. What weight of steel (g) should be dissolved in 100.0 ml in order to take 15 ml of this solution into a 50.00 ml flask to obtain a solution of B-chromolybdic heteropoly acid (e = 2800 l / (mol * cm) at 450 nm) , whose absorption in a 5 cm cuvette would correspond to the minimum error of photometric measurements (A = 0.600)?
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