Gas Stoichiometry
Gas Stoichiometry
Gas Stoichiometry
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<strong>Gas</strong> <strong>Stoichiometry</strong>Example:Stoich and STP Problems: <strong>Gas</strong> stoich problems at STP will allow you to use22.4 liters as a conversion factor. <strong>Gas</strong> stoich problems not at STP are a littledifferent. You need to use PV=nRT. You can still use stoich to go from moles tomoles BUT that is it. You must use the ideal gas law or the combined gas law tofind any volumes. 22.4 L is not allowed. Remember that is you want the volumeof gas X, you better be using the P, T, and n of gas X. Some kids mess that up.1. The single replacement reaction occurs between 45.9 g of zinc metal andhydrochloric acid at a temperature of 37 ºC and a pressure of 733 Torr.What volume of hydrogen gas is produced?For chemistry help, visit www.chemfiesta.com© 2003 Cavalcade Publishing – All Rights Reserved
PracticeFor all of these problems, assume that the reactions are being performed at apressure of 1.0 atm and a temperature of 298 K.1) Calcium carbonate decomposes at high temperatures to form carbondioxide and calcium oxide:CaCO 3(s) CO 2(g) + CaO (s)How many grams of calcium carbonate will I need to form 3.45 liters ofcarbon dioxide at a pressure of 1.0 atm and a temperature of 298 K.?2) Ethylene burns in oxygen to form carbon dioxide and water vapor:C 2 H 4(g) + 3 O 2(g) 2 CO 2(g) + 2 H 2 O (g)How many liters of water can be formed if 2.0 grams liters of ethylene areconsumed in this reaction a pressure of 1.0 atm and a temperature of 298K.?3) When chlorine is added to acetylene, 1,1,2,2-tetrachloroethane is formed:2 Cl 2(g) + C 2 H 2(g) C 2 H 2 Cl 4(l)How many liters of chlorine will be needed to make 75.0 grams ofC 2 H 2 Cl 4 ?For chemistry help, visit www.chemfiesta.com© 2003 Cavalcade Publishing – All Rights Reserved
<strong>Gas</strong> <strong>Stoichiometry</strong> Practice - SolutionsFor all of these problems, assume that the reactions are being performed at apressure of 1.0 atm and a temperature of 298 K.1) Calcium carbonate decomposes at high temperatures to form carbondioxide and calcium oxide:CaCO 3(s) CO 2(g) + CaO (s)How many grams of calcium carbonate will I need to form 3.45 liters ofcarbon dioxide?14.1 grams2) Ethylene burns in oxygen to form carbon dioxide and water vapor:C 2 H 4(g) + 3 O 2(g) 2 CO 2(g) + 2 H 2 O (g)How many liters of water can be formed if 1.25 liters of ethylene areconsumed in this reaction?2.50 liters3) When chlorine is added to acetylene, 1,1,2,2-tetrachloroethane is formed:2 Cl 2(g) + C 2 H 2(g) C 2 H 2 Cl 4(l)How many liters of chlorine will be needed to make 75.0 grams ofC 2 H 2 Cl 4 ?21.8 LFor chemistry help, visit www.chemfiesta.com© 2003 Cavalcade Publishing – All Rights Reserved
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