Chapter 11: GasesExample 1Example 2Example 3Example 4Example 5Example 6Example 7Example 8Example 9Example 10Chapter 11: Gases1. The Kinetic Molecular Theory of Gases2. Pressure3. Boyle’s Law, Charles’ Law, and the Combined Gas Law4. Avagadro’s Law5. The Ideal Gas Law6. STP and Molar Volume7. Mixtures of Gases8. Gases in Stoichiometry ProblemsExample 1Find the volume of a gas at a pressure of1.5 x 103 mmHg if it has a volume of 1.0 L at 1.0 atm.3 Assume thetemperature is unchanged.33 Answer: 0.51 LExample 2For a gas at 25ºC the volume3 is 2.0L.3 Find its volume at 100.ºC if its pressure remains constant. Answer: 2.5 LExample 3A sample of CO2 has a volume of 533 mLat 23.2ºC and 749 mmHg.3 How many moles of CO2 are in this sample? Answer: .0216 moles CO2Example 4What is the volume of a sample ofO2 at 25ºC and 1.00 atm if it hasa mass of 1.50 g? Answer: 1.15 LExample 5An experiment calls for 4.00 moles of COgas at STP.3 What volume of gas is this? Answer: 89.6 LExample 6An experimental undersea habitat had anatmosphere consisting of the following molepercents: 79.0% He17.0% N24.0% O2What are the partial pressures of each gas at 58.8 mbelow sea level where the pressure is 6.91 atm?Answer: 5.46 atm He, 1.17 atm N2, 0.28 atm O2Example 7The reaction between zinc metal and acid produces hydrogen gas.3 Assume the hydrogen produced by this reaction was collected over water at 753 mmHg and at 23ºC.3 If 215 mL of hydrogen were collected, what mass of hydrogen was produced? Answer: 1.72 x 10-2 g H2Example 8LiOH is used in spacecraft to absorb the CO2exhaled by the astronauts:33 2 LiOH(s)3 +3 CO2(g)3 3 Li2CO3(s)3 +3 H2O(l)What volume of CO2 can be absorbed by 1.00g of LiOH at 25.0°C and 1.00 atm?Answer: 0.511 LExample 9What volume of CO2 is produced when 1.0 L of propane gas, C3H8, burns at 1.00 atm and 550°C?Answer: 3.0 LExample 10Air bags inflate when sodium azide decomposes explosively to form sodium and nitrogen: 2 NaN3(s) 2 Na(s) + 3 N2(g)3What mass of NaN3 must decompose to inflate an air bag to 70.0 L at STP?Answer: 135
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