CHEM 1F92 Lecture Notes - Lecture 4: Chlorate, Lithium Nitride, Potassium Chloride
19 Oct 2015
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Assignment 4, version #464: many important metals occur as sulfide, arsenide, and antimonide minerals, especially in the sudbury mineral complex. The first step in processing these ores involves roasting the ore in air to produce the metal or metal oxide, along with nonmetal oxides that can be serious pollutants if not trapped. Suppose that you roast 1. 00 kg of the mineral shandite, ni3pb2s2. Number of moles of shandite in 1kg = 1000/654. 51 = 1. 53 moles. 2 moles of shandite = 6 moles of nio. So, 1. 53 moles of shandite = 1. 53*6/2 = 4. 59 moles of nio. 2 moles of shandite = 4 moles of pbo. So, 1. 53 moles of shandite = 1. 53*4/2 =3. 06 moles of pbo. 23% o2 by mass, and that the density of air at 25 c is 1. 2 g/l. Molar masses: ni3pb2s2 654. 6 g/mol nio 74. 69 g/mol pbo 223. 20 g/mol. The ratio of shandite and oxygen is 2:9 so we need [(1. 53*9)/2] moles of oxygen.
