LR 10 13 2014 1 Balance the following equations 2N2O5 2N2O4 O2 2KNO3 2KNO2 O2 NH4NO2 N2 2H2O 3KOH H3PO4 K3PO4 3H2O 2 A dry cleaning solvent contains C H and Cl and has a molar mass of 147g mol When a 0 250 g sample was studied by combustion analysis 0 451 g of CO2 and 0 0617 g of H2O formed Find the molecular formula for this solvent C 0 451g CO2 x 1mol CO2 x 1 mol C x 12 0 g C 0 123 g C 44 0 g CO2 1 mol CO2 1 mol C H 0 0617g H2O x 1mol H2O x 2 mol H x 1 01 g H 0 006924 g H 18 0 g H2O 1 mol H2O 1 mol H Cl 0 250g sample 0 123 g C 0 006924 g H 0 120 g Cl mol C 0 123g 12 0g mole 0 01025 mol 0 00338 3 mol H 0 006924g 1 10g mol 0 006855 mol 0 00338 2 mol Cl 0 120g 35 5g mol 0 00338 mol 0 00338 1 Empirical formula C3H2Cl Molecular formula 3 Mass of empirical formula 73 5 147 73 5 2 C6H4Cl2 Consider the reaction and answer the related questions Ag2S 2 HCl a 2 AgCl H2S How many grams of HCl are needed to react with 53 0 grams of Ag2S 53 0g Ag2S x 1mol Ag2S x 2 mol HCl x 36 5 g HCl 15 6 g HCl 248g Ag2S 1 mol Ag2S 1 mol HCl 1 b How many grams of H2S can form from the reaction of 87 4 grams of Ag2S with excess HCl 87 4g Ag2S x 1mol Ag2S x 1 mol H2S x 34 0 g H2S 12 0 g H2S 248g Ag2S 1 mol Ag2S 1 mol H2S c How many grams of Ag2S are needed to form 152 grams of AgCl 152g AgCl x 1mol AgCl x 1 mol Ag2S x 248g Ag2S 131g Ag2S 143 5g AgCl 2 mol AgCl 1 mol Ag2S 4 Cyanogen CN 2 has been observed in the atmosphere of Titan Saturn s largest moon and in the gases of interstellar nebulas Cyanogen reacts with fluorine according to the equation CN 2 g 7F2 g 2 CF4 g 2 NF3 g 80 0 grams of each reactant is available a Determine the limiting reactant and the maximum amount of CF4 that can form 80 0g CN 2 x 1mol CN 2 x 2 mol CF4 x 88 0 g CF4 271 g CF4 52 0g CN 2 1 mol CN 2 1 mol CF4 80 0g F2 x 1mol F2 x 2 mol CF4 x 88 0 g CF4 52 9g CF4 38 0g F2 7 mol F2 1 mol CF4 F2 is the limiting reactant and the maximum amount of CF4 that can form from these starting amounts is 52 9g b If 23 4 grams of CF4 were obtained what is the percent yield 23 4g x 100 44 2 52 9g 2
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