chem FinalExamPractice.doc - 1. Coniine, a toxic substance...

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1. Coniine, a toxic substance isolated from poison hemlock, contains only carbon, hydrogen and nitrogen. Combustion analysis of a 5.024 mg sample yields 13.90 mg of CO 2 and 6.048 mg of H 2 O. What is the empirical formula of coniine? 2. Calcium levels in blood can be determined by adding oxalate ion to make solid calcium oxalate (CaC 2 O 4 ), followed by dissolving the solid in aqueous acid to form oxalic acid (H 2 C 2 O 4 ). The oxalic acid is finally titrated with KMnO 4 , as in the UNBALANCED equation in acid: H 2 C 2 O 4 (aq) + MnO 4 - (aq) + H + (aq) CO 2 (g) + Mn 2+ (aq) + H 2 O(l) How many mg of Ca 2+ as present in 10.0 mL of blood if 21.08 mL of 0.000988 M KMnO 4 solution is needed for the titration? 3. Cisplatin [Pt(NH 3 ) 2 Cl 2 ], a compound used in cancer treatment, is prepared by reaction of ammonia with potassium terachloroplatinate (K 2 PtCl 4 ): K 2 PtCl 4 + 2NH 3 2KCl + Pt(NH 3 ) 2 Cl 2 How many grams of cisplatin are formed from 55.8 g of K 2 PtCl 4 and 35.6 g of NH 3 if the reaction takes place in 95% yield based on the
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This note was uploaded on 07/12/2011 for the course CHEMISTRY 2070 taught by Professor Disalvo during the Spring '11 term at Cornell University (Engineering School).

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chem FinalExamPractice.doc - 1. Coniine, a toxic substance...

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