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Potassium cyanide is a toxic substance, and the median lethal dose depends on the mass of the person or animal that ingests it. the median lethal dose of kcn for a person weighing 185 lb (83.9 kg ) is 8.50×10−3 mol . what volume of a 0.0320 m kcn solution contains 8.50×10−3 mol of kcn?

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W0lf93
(8.5 x 10^-3 mol) / (0.0320 mol/L KCN)=0.265625 L=265.625 ml. This is the volume of a 0.0320 M KCN solution that would give a median lethal dose to a 185 lb person.

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