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Course Number: CHEM 2301, Spring 2010

College/University: South Texas College

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Exercises 227 51. A 2.50-L container is filled with 175 g argon. a. If the pressure is 10.0 atm, what is the temperature? b. If the temperature is 225 K, what is the pressure? 52. A person accidentally swallows a drop of liquid oxygen, O2(1), which has a density of 1.149 g/mL. Assuming the drop has a volume of 0.050 ml., what volume of gas will be produced in the person's stomach at body temperature (37C) and a...

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A Exercises 227 51. 2.50-L container is filled with 175 g argon. a. If the pressure is 10.0 atm, what is the temperature? b. If the temperature is 225 K, what is the pressure? 52. A person accidentally swallows a drop of liquid oxygen, O2(1), which has a density of 1.149 g/mL. Assuming the drop has a volume of 0.050 ml., what volume of gas will be produced in the person's stomach at body temperature (37C) and a pressure of 1.0 atm? 53. A gas sample containing 1.50 mol at 2SOC exerts a pressure of 400. torr. Some gas is added to the same container and the temperature is increased to 50.oC. If the pressure increases to 800. torr, how many moles of gas were added to the container? Assume a constant-volume container. 54. A bicycle tire is filled with air to a pressure of 75. psi at a temperature of 19C. Riding the bike on asphalt on a hot day increases the temperature of the tire to 58C. The volume of the tire increases by 4.0%. What is the new pressure in the bicycle tire? 55. Consider two separate gas containers at the following conditions: 61. A sealed balloon is filled with 1.00 L helium at 23C and 1.00 atm. The balloon rises to a point in the atmosphere where the pressure is 220. torr and the temperature is - 31C. What is the change in volume of the balloon as it ascends from 1.00 atm to a pressure of 220. torr? 62. A hot-air balloon is filled with air to a volume of 4.00 X 103 nr' at 745 torr and 21C. The air in the balloon is then heated to 62C, causing the balloon to expand to a volume of 4.20 X 103 nr'. What is the ratio of the number of moles of air in the heated balloon to the original number of moles of air in the balloon? (Hint: Openings in the balloon allow air to flow in and out. Thus the pressure in the balloon is always the same as that of the atmosphere.) Gas Density, Molar Mass, and Reaction Stoichiometry 63. Consider the following reaction: It takes 2.00 L pure oxygen gas at STP to react completely with a certain sample of aluminum. What is the mass of aluminum reacted? 64. A student adds 4.00 g dry ice (solid COz) to an empty balloon. What will be the volume of the balloon at STP after all the dry ice sublimes (converts to gaseous COz)? 65. Air bags are activated when a severe impact causes a steel ball to compress a spring and electrically ignite a detonator cap. This causes sodium azide (NaN3) to decompose explosively according to the following reaction: 2NaN3(s) ----7 Container A Container B Contents: S02(g) Pressure = P A Moles of gas = 1.0 mol Volume = 1.0 L Temperature = 7C Contents: unknown gas Pressure = P B Moles of gas = 2.0 mol Volume = 2.0 L Temperature = 287C 2Na(s) + 3Nz(g) How the is pressure in container B related to the pressure in container A? 56. A glass vessel contains 28 g nitrogen gas. Assuming ideal behavior, which of the processes listed below would double the pressure exerted on the walls of the vessel? a. Adding enough mercury to fill one-half the container. b. Raising the temperature of the container from 30.oC to 60.oC. c. Raising the temperature of the container from -73C to 127C. d. Adding 28 g nitrogen gas. 57. A at a. b. c. container is filled with an ideal gas to a pressure of 40.0 atm OC. What will be the pressure in the container if it is heated to 45C? At what temperature would the pressure be 1.50 X 102 atm? At what temperature would the pressure be 25.0 atm? What mass of NaN3(s) must be reacted to inflate an air bag to 70.0 L at STP? 66. Concentrated hydrogen peroxide solutions are explosively decomposed by traces of transition metal ions (such as Mn or Fe): What volume of pure 02(g), collected at 27C and 746 torr, would be generated by decomposition of 125 g of a 50.0% by mass hydrogen peroxide solution? Ignore any water vapor that may be present. 67. In 1897 the Swedish explorer Andree tried to reach the North Pole in a balloon. The balloon was filled with hydrogen gas. The hydrogen gas was prepared from iron splints and diluted sulfuric acid. The reaction is Fe(s) 58. An ideal gas at 7C is in a spherical flexible container having a radius of 1.00 em. The gas is heated at constant pressure to 88C. Determine the radius of the spherical container after the gas is heated. [Volume of a sphere = (4/3)1Tr3.] 59. An ideal gas is contained in a cylinder with a volume of 5.0 X 102 mL at a temperature of 30.oC and a pressure of 710. torr. The gas is then compressed to a volume of 25 ml., and the temperature is raised to 820.oC. What is the new pressure of the gas? 60. A compressed gas cylinder contains 1.00 X 103 g argon gas. The pressure inside the cylinder is 2050. psi (pounds per square inch) at a temperature of 18C. How much gas remains in the cylinder if the pressure is decreased to 650. psi at a temperature of 26C? + H S0 (aq) Z 4 ----7 FeS04(aq) + Hig) The volume of the balloon was 4800 rrr' and the loss of hydrogen gas during filling was estimated at 20.%. What mass of iron splints and 98% (by mass) HzS04 were needed to ensure the complete filling of the balloon? Assume a temperature of OC, a pressure of 1.0 atm during filling, and 100% yield. 68. Sulfur trioxide, S03, is produced in enormous quantities each year for use in the synthesis of sulfuric acid. S(s) + + 0z(g) Oz(g) ----7 ----7 SOz(g) 2S03(g) 2S0z(g)

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South Texas College - CHEM - 2301
228Chapter FiveGasesWhat volume of 02(g) at 350.oC and a pressure of 5.25 atm is needed to completely convert 5.00 g sulfur to sulfur trioxide? 69. A 20.0-L nickel container was charged with 0.500 atm of xenon gas and 1.50 atm of fluorine gas at 400.e.
South Texas College - CHEM - 2301
Exercises22985. The partial pressure of CH4(g) is 0.175 atm and that of 02(g) is 0.250 atm in a mixture of the two gases. a. What is the mole fraction of each gas in the mixture? b. If the mixture occupies a volume of 10.5 L at 65 C, calculate the total
South Texas College - CHEM - 2301
230ChapterFiveGasesa. Which gas sample has the most molecules present? Explain. b. Which gas sample has the largest average kinetic energy? Explain. c. Which gas sample has the fastest average velocity? Explain. d. How can the pressure in the two cont
South Texas College - CHEM - 2301
AdditionaL Exercises231119. The nitrogen content of organic compounds can be determined by the Dumas method. The compound in question is first reacted by passage over hot CuO(s): Compound-c> N2(g) (uo(.<)Hot+COig)+H20(g) solution KOH sovapor. In p
South Texas College - CHEM - 2301
232ChapterFiveGases132. Nitric acid is produced commercially by the Ostwald process. In the first step ammonia is oxidized to nitric oxide: 4NH3(g)be 4.02 g/L at 127C and 256 torr. What are the empirical and molecular formulas of the compound? 136. C
South Texas College - CHEM - 2301
IntegrativeProbLems233calculate the flow rate of air necessary to deliver the required amount of oxygen. b. Under the conditions in part a, combustion of methane was not complete as a mixture of CO2 (g) and CO(g) was produced. It was determined that 95
South Texas College - CHEM - 2301
234Chapter FiveGases~ Marathon Problem*This problem is designed to incorporate several concepts and techniques into one situation.153. Use the following information to identify element A and compound B, then answer questions a and b. An empty glass c
South Texas College - CHEM - 2301
South Texas College - CHEM - 2301
South Texas College - CHEM - 2301
Chapter 12Chemical KineticsChapter 12Table of Contents 12.1 Reaction Rates 12.2 Rate Laws: An Introduction 12.3 Determining the Form of the Rate Law 12.4 The Integrated Rate Law 12.5 Reaction Mechanisms 12.6A Model for Chemical Kinetics 12.7CatalysisC
South Texas College - CHEM - 2301
South Texas College - CHEM - 2301
South Texas College - CHEM - 2301
South Texas College - CHEM - 2301
South Texas College - CHEM - 2301
South Texas College - CHEM - 2301
South Texas College - CHEM - 2301
South Texas College - CHEM - 2301
South Texas College - CHEM - 2301
South Texas College - CHEM - 2301
South Texas College - CHEM - 2301
South Texas College - CHEM - 2301
South Texas College - CHEM - 2301
South Texas College - CHEM - 2301
South Texas College - CHEM - 2301
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