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224 Chapter 4 Stoichiometry of Chemical Reactions (f) 43. 44. the (a) (b) (d) The number of moles and the mass of water formed by the combustion of 20.0 kg of acetylene, C2H2, in an excess of oxygen. (e) The number of moles and the mass of barium peroxide, BaO2, needed to produce 2.500 kg of barium oxide, BaO (O2 is the other product.) (f) 45. Determine the number of moles and the mass requested for each reaction in Exercise 4.44. 46. H2 is produced by the reaction of 118.5 mL of a 0.8775-M solution of H3PO4 according to the following equation: 2Cr + 2H3 PO4 ⟶ 3H2 + 2CrPO4. (a) Outline the steps necessary to determine the number of moles and mass of H2. (b) Perform the calculations outlined. 47. Gallium chloride is formed by the reaction of 2.6 L of a 1.44 M solution of HCl according to the following equation: 2Ga + 6HCl ⟶ 2GaCl3 + 3H2. (a) Outline the steps necessary to determine the number of moles and mass of gallium chloride. (b) Perform the calculations outlined. 48. I2 is produced by the reaction of 0.4235 mol of CuCl2 according to the following equation: 2CuCl2 + 4KI ⟶ 2CuI + 4KCl + I2. (a) How many molecules of I2 are produced? (b) What mass of I2 is produced? 49. Silver is often extracted from ores as K[Ag(CN)2] and then recovered by the reaction 2K⎡⎣Ag(CN)2⎤⎦(aq) + Zn(s) ⟶ 2Ag(s) + Zn(CN)2(aq) + 2KCN(aq) Determine the number of moles and the mass requested for each reaction in Exercise 4.42. Write the balanced equation, then outline the steps necessary to determine the information requested in each of following: The number of moles and the mass of Mg required to react with 5.00 g of HCl and produce MgCl2 and H2. The number of moles and the mass of oxygen formed by the decomposition of 1.252 g of silver(I) oxide. The number of moles and the mass of magnesium carbonate, MgCO3, required to produce 283 g of carbon (c) dioxide. (MgO is the other product.) This content is available for free at http://cnx.org/content/col11760/1.9PDF Image | Stoichiometry of Chemical Reactions
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