| Chapter 1 | Problems 1, 5, 9, 13, 15, 19, 21, 25, 29, 33, 37, and 41. |
| Chapter 2 | Problems 1, 3, 5, 9, 13, 17, 21, 25, 27, 29, 33, and 45. |
| Chapter 3 | Problems 1, 5, 9, 11, 15, 19, 21, 27, 31, 35, and 41. |
| Chapter 22 | Problems 3, 5, 9, 13, 17, 21, 23, 27, 31, 35, 41, 45, and 49. |
(1) A sample of K2CO3 weighing 27.6 g was treated by a series of reactants so as to convert all its carbon to K2Zn3[Fe(CN)6]2. How many grams of product were obtained?
(2) One gram of a gaseous compound of carbon and hydrogen gives upon combustion 3.30 g of carbon dioxide and 0.899 g of water. What is the empirical (simple) formula?
In a separate experiment, the density of a gaseous sample of the compound is found to be 1.78 g/L under conditions of STP. What is the molecular (true) formula?
(3) One volume of a gaseous compound of hydrogen, carbon, and nitrogen gave upon combustion 2 volumes of CO2, 3.5 volumes of H2O, and 0.5 volumes of N2, all measured at the same Temperature and Pressure. What is the empirical formula of the compound? Can the molecular formula be found from these data?
(4) A 1.000 g mixture of Cu2O and CuO was quantitatively reduced to 0.839 g of Cu. What was the weight of CuO in the original sample of the mixture?
(5) When BaBr2 is heated in a stream of chlorine gas, it is completely converted to BaCl2. From 1.50 g of BaBr2 just 1.05 g of BaCl2 is obtained. Calculate the atomic weight of Ba from these data.
(6) A mixture of KBr and NaBr weighing 0.560 g was treated with aqueous silver nitrate and all the bromide ion was recovered as 0.970 g of pure AgBr. What was the fraction by weight of KBr in the original sample?
(7) The commercial isolation of tungsten begins with the mineral Scheelite, the principal component of which is calcium tungstate (CaWO4), which is in turn converted to tungstic acid, the hydrous (hydrated) oxide (H2WO4), by treatment with concentrated hydrochloric acid (HCl). At elevated temperatures, tungstic acid can be reduced in a charcoal lined furnace directly to the pure metal. (For a helpful information, see the discussion of the incandescent light bulb and the tungsten filament on the handout. In the key reduction step, a 100. gram sample of pure tungstic oxide is reduced (as described above) with 10.0 grams of charcoal. What is the limiting reagent and the maximum yield (in grams) of tungsten that can be realized by this process?
(8) A mixture of only calcium tungstate (CaWO4) and iron tungstate (FeWO4) weighed 1.0 grams. Both of these insoluble tungstates were converted to the soluble sodium tungstate (Na2WO4) which also weighed 1.0 gram. Determine the wt.-% calcium tungstate in the mixture.
(9) Estimate the number of tungsten atoms in a 15-watt light bulb filament. See "bulb" handout.