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# Practice question-set1-Stoiciometry (1).doc

5 Pages
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School
University of Toronto Mississauga
Department
Chemistry
Course
CHM242H5
Professor
Judith C Poe
Semester
Fall

Description
1) According to the following balanced reaction, how many moles of NO are formed from 8.44 moles of NO2 if there is plenty of water present? 3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g) A) 2.81 moles NO B) 25.3 moles NO C) 8.44 moles NO D) 5.63 moles NO E) 1.83 moles NO 2) How many grams of Li3N can be formed from 1.75 moles of Li? Assume an excess of nitrogen. 6 Li(s) + N2(g) → 2 Li3N(s) A) 18.3 g Li3N B) 20.3 g Li3N C) 58.3 g Li3N D) 61.0 g Li3N E) 15.1 g Li3N 3) How many moles of oxygen are formed when 58.6 g of KNO3 decomposes according to the following reaction? The molar mass of KNO3 is 101.11 g/mol. 4 KNO3(s) → 2 K2O(s) + 2 N2(g) + 5 O2(g) A) 0.290 mol O2 B) 0.580 mol O2 C) 18.5 mol O2 D) 0.724 mol O2 E) 1.73 mol O2 4) Determine the theoretical yield of H2S (in moles) if 4.0 mol Al2S3 and 4.0 mol H2O are reacted according to the following balanced reaction. A possibly useful molar mass is Al2S3 = 150.17 g/mol. Al2S3 (s) + 6 H2O(l) → 2 Al(OH)3 (s) + 3 H2S(g) A) 12 mol H2S B) 4.0 mol H2S C) 18 mol H2S D) 6.0 mol H2S E) 2.0 mol H2S 5) A 12.39 g sample of phosphorus reacts with 42.54 g of chlorine to form only phosphorus trichloride (PCl3). If it is the only product, what mass of PCl3 is formed? A) 30.15 g B) 54.93 g C) 140.01 g D) 79.71 g E) 91.86 g 6) Which of the following solutions will have the highest concentration of chloride ions? A) 0.10 M NaCl B) 0.10 M MgCl2 C) 0.10 M AlCl3 D) 0.05 M CaCl2 E) All of these solutions have the same concentration of chloride ions. 7) How many moles of NaCl are required to make 250 mL of a 3.00 M solution? A) 750 moles B) 0.750 moles C) 3 moles D) 0.250 moles 8) How many milliliters of a 0.266 M LiNO3 s
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