Discussion 3_CHE 2A C06-07 credit T.A. MAO.pdf

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Department
Chemistry
Course Code
CHE 2A
Professor
A N D R E A S T O U P A D A K I S

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Discussion 3: CHE 2A C06-07 1. Find the Molecular Mass FeO 2 MgBr 2 2. Find the mass percentage What is the percent mass of C in CCl 2 2 What is the percent mass of oxygen in SiO ?2 3. Empirical Formula a. We decompose water into 0.857g ofhydrogen and 6.86 g of oxygen. What is the molecular formula for this compound? b. CxHy+ O 2 CO + H2O 2 Upon combustion, a compound containing onlycarbon and hydrogen produced 1.83g CO a2d 0.901g H O. 2ind the empirical formula of the compound. 4. Determine oxidation states of the underlined element in each molecule FeBr 2 SO3 -2 5. Naming Inorganic NaCl MgCl 2 6. Molecular Compounds NI3 P4 10 7. Naming Acids HCl HF 8. Naming polyatomic ions NaNO 3 NH NO 4 3 9. Naming oxoacids H2SO 4 HNO 2 10.Balance the following chemical equationsby inspection: SO3 SO 2 O 2 Mg 3 2 H O2 Mg(OH) +2 NH 3 S Cl + NH N S + NH Cl + S 2 2 3 4 4 4 8 11.In an experiment, 0.689 g Cr(s) reacts completely with 0.636 g O 2g) to form a single solid compound. Write a balanced chemical equation for the reaction. 12.If 46.3 g PC3 is produced by the reaction (unbalanced equation): Cl2(g)+ P 4s) PCl3(l) How many grams each of Cl a2d P ar4 consumed? Notes: molar mass Cr: 51.9961 g/mol; O: 15.9994 g/mol; Cl: 35.453 g/mol; P: 30.9738 g/mol C: 12.0107 g/mol; Fe: 55.845 g/mol; Mg: 24.3050 g/mol;Br: 79.904 g/mol F: 18.9984 g/mol; Si: 28.0855 g/mol Discussion 3: CHE 2A C06-07 Solutions 1. Molecular Mass FeO 2 (16.01*2) + 55.85 g MgBr 2 = 184.1 g 2. Mass percentage What is the percent mass of C in CCl2 2? (12) / ( 119) x 100% = 10% What is the percent mass of oxygen in SiO 2 (16*2) / ( 60.09 ) = 53% 3. Empirical Formula a. We decompose water into 0.857g ofhydrogen and 6.86 g of oxygen. What is the molecular formula for this compound? 0.857 g H x (1 mol H/ 1.01 g H) = 0.849 mol H /0.429 mol = 1.98 6.86 g O x ( 1 mol O / 16 g O) = 0.429 mol O /0.429 mol = 1 H 2 b. C x y O 2CO + H2O 2 Upon combustion, a compound containing onlycarbon and hydrogen produced 1.83g CO and 0.901g H O. Find the empirical formula of 2
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