Chemistry by OpenStax (2015-05-04)
Chemistry by OpenStax (2015-05-04)
1st Edition
ISBN: 9781938168390
Author: Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher: OpenStax
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Chapter 9, Problem 97E

Answer the following questions:

(a) Is the pressure of the gas in the hot air balloon shown at the opening of this chapter greater than, less than, or equal to that of the atmosphere outside the balloon?

(b) Is the density of the gas in the hot air balloon shown at the opening of this chapter greater than, less than, or equal to that of the atmosphere outside the balloon?

(c) At a pressure of 1 atm and a temperature of 20 °C, dry air has a density of 1.2256 gt. What is the (average) molar mass of div air?

(d) The average temperature of the gas in a hot air balloon is 1.30 × 10 2 °F. Calculate its density, assuming the molar mass equals that of div air.

(e) The lifting capacity of a hot air balloon is equal to the difference in the mass of the cool air displaced by the balloon and the mass of the gas in the balloon. What is the difference in the mass of 1.00 L of the cool air in part (c) and the hot air in part (d)?

(f) An average balloon has a diameter of 60 feet and a volume of 1.1 × 10 5 ft 3 . What is the lifting power of such a balloon? If the weight of the balloon and its rigging is 500 pounds, what is its capacity for carrying passengers and cargo?

(g) A balloon carries 40.0 gallons of liquid propane (density 0.5005 g/L). What volume of CO 2 and H 2 O gas is produced by the combustion of this propane?

(h) A balloon flight can last about 90 minutes. If all of the fuel is burned during this time, what is the approximate rate of heat loss (in kJ/min) from the hot air in the bag during the flight?

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Chapter 9 Solutions

Chemistry by OpenStax (2015-05-04)

Ch. 9 - Consider this scenario and answer the following...Ch. 9 - Why is it necessary to use a nonvolatile liquid in...Ch. 9 - The pressure of a sample of gas is measured at sea...Ch. 9 - The pressure of a sample of gas is measured with...Ch. 9 - The pressure of a sample of gas is measured at sea...Ch. 9 - The pressure of a sample of gas ¡s measured a sea...Ch. 9 - How would the use of a volatile liquid affect the...Ch. 9 - Sometimes leaving a bicycle in the sun on a hot...Ch. 9 - Explain how the volume of the bubbles exhausted by...Ch. 9 - One way to state Boyle’s law is All other things...Ch. 9 - An alternate way to state Avogadro’s law is A1l...Ch. 9 - How would the graph in Figure 9.12 change if the...Ch. 9 - How would the graph in Figure 9.13 change if the...Ch. 9 - In addition to the data found in Figure 9.13, what...Ch. 9 - Determine the volume of 1 mol of CH4 gas at 150 K...Ch. 9 - Determine the pressure of the gas in the syringe...Ch. 9 - A spray can is used until it is empty except for...Ch. 9 - What is the temperature of an 11.2-L sample of...Ch. 9 - À 2.50-L volume of hydrogen measured at —196 C is...Ch. 9 - A balloon inflated with three breaths of air has a...Ch. 9 - A weather balloon contains 8.80 moles of helium at...Ch. 9 - The volume of an automobile air bag was 66.8 L...Ch. 9 - How many moles of gaseous boron trifluoride, BF3,...Ch. 9 - Iodine, I2, is a solid at room temperature but...Ch. 9 - How many grams of gas are present in each of the...Ch. 9 - A high altitude balloon is filled with 1041104 L...Ch. 9 - A cylinder of medical oxygen has a volume of 3S.4...Ch. 9 - A large scuba tank (Figure 9.16) with a volume of...Ch. 9 - A 20.0-L cylinder containing 11.34 kg of butane,...Ch. 9 - While resting, the average 70-kg human male...Ch. 9 - For a given amount of gas showing ideal behavior,...Ch. 9 - A liter of methane gas, CH4, at STP contains more...Ch. 9 - The effect of chlorofluorocarbons (such as CCl2F2)...Ch. 9 - As 1 g of (lie radioactive element radium decays...Ch. 9 - A balloon that is 100.21 L at 21 C and 0.981 atm...Ch. 9 - If the temperature of a fixed amount of a gas is...Ch. 9 - If the volume of a fixed amount of a gas is...Ch. 9 - What is the density of laughing gas, dinitrogen...Ch. 9 - Calculate the density of Freon 12, CF2Cl2, at 30.0...Ch. 9 - Which is denser at the same temperature and...Ch. 9 - A cylinder of O2(g) used in breathing by emphysema...Ch. 9 - What is the molar mass of a gas if 0.0494 g of the...Ch. 9 - What is the molar mass of a gas if 0.281 g of the...Ch. 9 - How could you show experimentally that the...Ch. 9 - The density of a certain gaseous fluoride of...Ch. 9 - Consider this question: What is the molecular...Ch. 9 - A 36.0—L cylinder of a gas used for calibration of...Ch. 9 - A cylinder of a gas mixture used for calibration...Ch. 9 - A sample of gas isolated from unrefined petroleum...Ch. 9 - A mixture of 0.200 g of 1.00 g of and 0.820 g of...Ch. 9 - Most mixtures of hydrogen gas with oxygen gas are...Ch. 9 - A commercial mercury vapor analyzer can detect in...Ch. 9 - A sample of carbon monoxide was collected over...Ch. 9 - In an experiment in a general chemistry...Ch. 9 - Joseph Priestley first prepared pure oxygen by...Ch. 9 - Cavendish prepared hydrogen in 176G by the novel...Ch. 9 - The chlorofluorocarbon CCl2F2 can be recycled into...Ch. 9 - Automobile air bags are inflated with nitrogen...Ch. 9 - Lime, CaO, is produced by heating calcium...Ch. 9 - Before small batteries were available, carbide...Ch. 9 - Calculate the volume of oxygen required to burn...Ch. 9 - What volume of O2 at STP is required to oxidize...Ch. 9 - Consider the following questions: (a) What is the...Ch. 9 - Methanol, CH3OH, is produced industrially by the...Ch. 9 - What volume of oxygen a 423.0 K and a pressure of...Ch. 9 - A 230-L sample of a colorless gas at STP...Ch. 9 - Ethanol, C2H5OH, is produced industrially from...Ch. 9 - One molecule of hemoglobin will combine with four...Ch. 9 - A sample of a compound of xenon and fluorine was...Ch. 9 - One method of analyzing amino acids is the van...Ch. 9 - A balloon filled with helium gas is found to take...Ch. 9 - Explain why the numbers of molecules are not...Ch. 9 - Starting with the definition of rate of effusion...Ch. 9 - Heavy water, D2O (molar mass = 20.03 g mol-1). can...Ch. 9 - Which of the following gases diffuse more slowly...Ch. 9 - During the discussion of gaseous diffusion for...Ch. 9 - Calculate the relative rate of diffusion of 1H2...Ch. 9 - A gas of unknown identity diffuses at a rate of...Ch. 9 - When two cotton plugs. one moistened with ammonia...Ch. 9 - Using the postulates of the kinetic molecular...Ch. 9 - Can the speed of a given molecule in a gas double...Ch. 9 - Describe what happens o the average kinetic energy...Ch. 9 - The distribution of molecular velocities in a...Ch. 9 - What is the ratio of the average kinetic energy of...Ch. 9 - A 1-L sample of CO initially at STP is heated to...Ch. 9 - The root mean square speed of H2, molecules at 25...Ch. 9 - Answer the following questions: (a) Is the...Ch. 9 - Show that the ratio of the rate of diffusion of...Ch. 9 - Graphs showing the behavior of several different...Ch. 9 - Explain why the plot of PV for CO2 differs from...Ch. 9 - Under which of the following sets of conditions...Ch. 9 - Describe the factors responsible for the deviation...Ch. 9 - For which of the following gases should the...Ch. 9 - A 0.245-L flask contains 0.467 mol CO2 at 159 C....Ch. 9 - Answer the following questions: (a) If XX behaved...
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