ࡱ> 46123 bjbj 1EeeN+T**82:2:::::::$>@=:Q=:**:;%;%;%:*:;%:;%;%6D6C9f  8&::0:E8\A"`\ALC9\AC9;%=:=:5$:\A :  Gas Laws AP Chemistry Ms. LaCosse Avogadros Hypothesis/Law- Ideal Gas Law- Practice: Carry all problems out to three significant figures. 1. A flashbulb of volume 2.6 cm3 contains O2 gas at a pressure of 2.3 atm and a temperature of 26 C. How many moles of O2 does the flashbulb contain? 1b. How many grams of oxygen is this? 1c. What is the density of oxygen in the container? (mass/volume) 2. A deep breath of air has a volume of 1.05 L at a pressure of 740 mm Hg and body temperature, 37 C. Calculate the number of molecules in the breath. 2b. Many gases are shipped in high-pressure containers. Consider a steel tank whose volume is 42.0 L and which contains O2 gas at a pressure of 18,000 kPa at 23 C. What mass of O2 does it contain? What volume would the gas occupy at STP? Ideal Gas Law Practice How many moles of air are there in the lungs of an average adult with a total lung capacity of 3.8 L? Assume that the person is at 1.0 atm pressure and has a normal body temperature of 37 C. How many moles of methane gas, CH4, are in a 100,000 L storage tank at STP? How many grams is this? An aerosol spray can with a volume of 350 mL contains 3.2 g of propane gas (C3H8) as a propellant. What is the pressure in atm in the can at 20 C? A helium gas cylinder of the sort used to fill balloons has a volume of 43.8 L and a pressure of 1.51 x 104 kPa at 25.0 C. How many moles of Helium are in the tank? What final temperature in C is required for the pressure inside an automobile tire to increase from 2.15 atm at 0 C to 2.37 atm assuming the volume remains constant? Carry out the following conversions: 4.81 atm to pascals b) 1023 mm Hg to atm c) .0023 atm to Pa Which sample contains more molecules: 2.50 L of air at 50 C and 750 mm Hg pressure or 2.16 L of CO2 at 10 C and 765 mm Hg pressure? Oxygen gas is commonly sold in 49.0 L steel containers at a pressure of 150 atm. What volume in liters would the gas occupy at a pressure of 1.02 atm if its temperature remained constant? If its temperature were raised from 20.0 C to 35 C at constant pressure of 150 atm? Gas pressure in interplanetary space is approximately 10-14 mm Hg at a temperature of approximately 1K. If the gas is almost entirely hydrogen, what volume in liters is occupied by 1 mol of H2 molecules? What is the density of H2 gas in molecules per liter? If 15.0 g of CO2 gas has a volume of 0.30 L at 300 K, what is its pressure in mm Hg? 11. When a sample of oxygen gas in a closed container of constant volume is heated until its absolute temperature is doubled, which of the following is also doubled? (A) The density of the gas (B) The pressure of the gas (C) The average velocity of the gas molecules (D) The number of molecules per cm3 (E) The potential energy of the molecules 12. A 2.00-liter sample of nitrogen gas at 27 C and 600. millimeters of mercury is heated until it occupies a volume of 5.00 liters. If the pressure remains unchanged, the final temperature of the gas is (A) 68 C (B) 120 C (C) 477 C (D) 677 C (E) 950. C 13. Two flexible containers for Gas are at the same temperature and pressure. One holds 0.50 gram of hydrogen and the other holds 8.0 grams of oxygen. Which of the following statements regarding these gas samples is FALSE? (A) The volume of the two containers is the same. (B) The number of molecules of hydrogen and the number of oxygen are the same. (C) The density of the hydrogen sample is less than that of the oxygen sample. (D) The average kinetic energy is the same for both molecules. (E) The average speed of the hydrogen molecules is the same as the average speed of the oxygen molecules. 14. A sample of 0.010 mole of oxygen gas is confined at 127 C and 0.80 atmospheres. What would be the pressure of this sample at 27 C and the same volume? (A) 0.10 atm (B) 0.20 atm (C) 0.60 atm (D) 0.80 atm (E) 1.1 atm 15. A sample of 0.0100 mole of oxygen gas is confined at 37 C and 0.216 atmosphere. What would be the pressure of this sample at 15 C and the same volume? (A) 0.0876 atm (B) 0.175 atm (C) 0.201 atm (D) 0.233 atm (E) 0.533 atm 16. A sample of 3.0 grams of an ideal gas at 121 C and 1.0 atmosphere pressure has a volume of 1.0 liters. Which of the following expressions is correct for the molar mass of the gas? The ideal gas constant, R, is 0.08 (L-atm) / (mole K). (A) [(0.08)(400)] / [(3.0)(1.0)(1.5)] (B) [(l.0)(l.5)] / [(3.0)(0.08)(400)] (C) [(0.08)(1.0)(1.5)] / [(3.0)(400)] (D) [(3.0)(0.08)(400)] / [(1.0)(1.5)] (E) [(3.0)(0.08)(1.5)] / (1.0)(400)] Finding Gas Density and Molecular Weight Density = Molecular Mass= What is the density of carbon dioxide gas at 745 mmHg and 65C? Pure oxygen gas is prepared by the following reaction: 2HgO (s) ( 2 Hg (l) + O2 (g) What is the volume in liters of oxygen at STP released by heating 10.57 grams of HgO? b. What volume of oxygen would be produced at 25C and 1.2 atm? Gas Density/Stoichiometry Practice What is the density of ammonia, NH3, in g/L at STP if the gas in a 1.000 L bulb weights 0.672 g at 25 C and 733.4 mm Hg pressure? To identify the contents of an unlabeled cylinder of gas, a sample was collected and found to have a density of 5.380 g/L at 15 C and 736 mm Hg pressure. What is the molar mass of the gas? Carbonate-bearing rocks like limestone (CaCO3) react with dilute acids such as HCl to produce carbon dioxide according to the equation: CaCO3(s) + 2HCl(aq) ( CaCl2(aq) + CO2(g) + H2O(l) How many grams of carbon dioxide would be formed by a complete reaction of 33.7 g of limestone? What is the volume in liters of this CO2 at STP? Propane gas (C3H8) is used as a fuel in rural areas. How many liters of CO2 are formed at STP by complete combustion of the propane in a metal bottle with a volume of 15.0 L and a pressure of 4.5 atm at 25C? The equation is: C3H8(g) + 5 O2(g) ( 3CO2(g) + 4 H2O(l) A foul-smelling gas produced by reaction of HCl with Na2S was collected, and a 1.00L sample was found to have a mass of 1.52 g at STP. What is the molecular weight of the gas? What is its likely formula and name? What is the molecular weight of a gas with each of the following densities? 1.342 g/L at STP 1.053 g/L at 25 C and 752 mm Hg Hydrogen gas can be prepared by reaction of zinc metal with aqueous HCl. Zn(s) + 2HCl(aq) ( ZnCl2(aq) + H2(g) How many liters of H2 would be formed at 742 mm Hg and 15 C if 25.5 g of zinc was allowed to react? How many grams of zinc would you start with if you wanted to prepare 5.00L of H2 at 350 mm Hg and 30.0 C? 8. A hydrocarbon gas with an empirical formula CH2 has a density of 1.88 grams per liter at 0 C and 1.00 atmosphere. A possible formula for the hydrocarbon is (A) CH2 (B) C2H4 (C) C3H6 (D) C4H8 (E) C5H10 9. 2 K + 2 H2O ---> 2 K+ + 2 OH + H2 When 0.400 mole of potassium reacts with excess water at standard temperature and pressure as shown in the equation above, the volume of hydrogen gas produced is (A) 1.12 liters (B) 2.24 liters (C) 3.36 liters (D) 4.48 liters (E) 6.72 liters 10. A sample of 9.00 grams of aluminum metal is added to an excess of hydrochloric acid. The volume of hydrogen gas produced at standard temperature and pressure is (A) 22.4 liters (B) 11.2 liters (C) 7.46 liters (D) 5.60 liters (E) 3.74 liters Molecular Weight Determination Practice (and some others) 1. Propylene is one of the most important chemicals produced by the chemical industry. It is used in many synthesis reactions (polypropylene). A glass reaction vessel weighs 40.1305 g when clean, dry, and evacuated. The same vessel weighs 138.2410 g when filled with water at 25 degrees Celsius. The density of water at 25 degrees Celsius is 0.9970 grams per ml. This same glass vessel has a weight of 40.2959 g when filled with propylene gas at 740.4 torrs and 24 degrees Celsius. What is the molecular weight of propylene? 2.Explain why SO2 is polar whereas CO2 is not. 3. A 2.650 g sample of a gas occupies a volume of 428 ml at 742.3 torrs and 24.3 degrees Celsius. The analysis of this compound shows that it is 15.5% carbon, 23.0% chlorine, and the remainder is fluorine. What is the molecular weight and molecular formula of this compound? Since this is an organic compound, suggest a possible structure. 4. For the ClNO2 molecule, show the geometry (shape) and hybridization by using the VSEPR theory. 5. A large flask is evacuated and found to weigh 134.567 g. It is then filled to a pressure of 735 torrs at 31 degrees Celsius with a gas of unknown molar mass and then reweighed. Its new mass is 137.456 g. The flask is then emptied and filled with water at 31 degrees C. Its mass is now 1067.91 grams. What is the molar mass of this unknown gas? (The density of water at 31 degrees C is 0.996 g/ml.) 6. As you know, our ideal gas law equation constant is 0.0821 literatmospheres per moleKelvin. What would the constant look like (value and units) if we were to use torrs, ml, moles, and Kelvin for the standard conditions? Gas Mixtures and Partial Pressures Daltons Law of Partial Pressures Partial Pressures and Mole Fractions Collecting Gases over Water Examples: 1. A gaseous mixture made from 6.0 g of O2 and 9.0 g CH4 is placed in a 15.0 L vessel at 0 degrees Celsius, what is the partial pressure of each gas and what is the total pressure of the vessel? 2. The mole fraction of nitrogen in air is 0.78 (in other words, 78% of the molecules in air are N2). If the total pressure is 760 torr, what is the partial pressure of N2? Daltons Partial Pressures Ptotal = P1 + P2 + P3 +. . . at constant volume and temperature Mole fraction (x) = moles of component Total moles in mixture (Mole percent = mole fraction X 100) PV=(n1 + n2 +n3 . . . )RT (to find the total pressure of a mixture of gases, you need to sum up the total number of moles of gas) What pressure, in atm, is exerted by a mixture of 2.00g ofH2 and 8.00g of N2 at 273 K in a 10.0 L vessel? A study of the effects of certain gases on plant growth requires a synthetic atmosphere composed of 1.5 mol percent CO2, 18.0 mol percent O2, and 80.5 mol percent Ar. a. Calculate the partial pressure of O2 in the mixture if the total pressure of the atmosphere is to be 745 mm Hg. b. If this atmosphere is to be held in a 120 L space at 295 K, how many moles of O2 are needed? At an underwater depth of 250 feet, the pressure is 8.38 atm. What should the mole percent of oxygen in the diving gas be for the partial pressure of oxygen in the mixture to be 0.21 atm, the same as it is in air at 1 atm. A mixture containing 0.125 mol CH4(g), 0.250 mol C2H6(g), and 0.075 mol O2(g) is confined in a 2.00 L vessel at 22 C. (a) Calculate the partial pressure of CH4 in the mixture. (b) Calculate the total pressure of the mixture. What are the mole fractions of each component in a mixture of 12.45 g of H2, 60.67g of N2, and 2.38g of NH3? What is the total pressure in atm and what is the partial pressure of each component if the gas mixture in problem 5 is in a 10.00 L steel container at 90 C? On a humid day in summer, the mole fraction of gaseous H2O (water vapor) in the air at 25 C can be as high as 0.0287. Assuming a total pressure of 0.977 atm, what is the partial pressure in atm of H2O in the air? Natural gas is a mixture of many substances, primarily CH4, C2H6, C3H8, and C4H10. Assuming that the total pressure of the gases is 1.48 atm and that their mole ratio is 94 : 4 : 1.5 : 0.5, calculate the partial pressure of each gas. A gas mixture sold commercially for use in certain lasers contains 5.00% by weight HCl, 1.00% H2, and 94% Ne. What is the mole fraction of each gas in the mixture? Magnesium metal reacts with aqueous HCl to yield H2 gas: Mg(s) + 2HCl(aq) ( MgCl2(aq) + H2(g) The gas that forms is found to have a volume of 3.557 L at 25 C and a pressure of 747 mm Hg. Assuming that the gas is saturated with water vapor at a partial pressure of 23.8 mm Hg, what is the partial pressure in mm Hg of the H2? How many grams of magnesium metal were used in the reaction? Kinetic Molecular Theory and Grahams Law Sections 10.7 and 10.8 10.7 The Ideal Gas Law tells us how the gases behave. Review: As Pressure Increases, Volume ______ As Temperature Increases, Pressure ______ As Temperature Increases, Volume ______ Kinetic Molecular Theory tries to explain why. Kinetic Molecular Theory Postulates . An extra one to remember this year: 5. Average Kinetic Energy is proportional to ____________________. (TAKE) Therefore, 2 gases at the same temperature will have the ______ Ave. K.E. As temperature doubles, average kinetic energy will __________________. The word AVERAGE implies that some molecules will be moving quickly while other molecules will be moving slowly.  Since mass doesnt change with changing temperature then speed must. Understanding Gas Behavior: Pressure- is caused by Effect of volume increase at constant temperature: Effect of temperature at constant volume: 10.8 Kinetic Energy will increase with increasing temperature due to the speed of the particle. Calculating Speed  Lighter Molecules will travel _____________ than heavier molecules. Effusion, Diffusion, and Grahams Law Effusion: Diffusion: Grahams Law of Effusion (also works for diffusion calculations!)  An answer to one of these questions might look like this: rCO/rNO is 1.035. This can be said The rate of effusion of CO is 1.035 times faster than the rate of NO. 1. An unknown gas composed of two diatomic molecules effuses at a rate that is only 0.355 times that of O2 at the same temperature. What is the identity of the gas? 2. Place the following gases in order of increasing average molecular speed at 300K: CO2, N2O, HF, F2, H2. Calculate and compare the rms speeds of H2 and CO2 molecules at 300K. Kinetic Theory/Grahams Law Calculate the average speed of a nitrogen molecule in m/s on a hot day in summer (T= 37 C) and on a cold day in winter (T = - 25C). Assume that you have a sample of hydrogen gas containing H2, HD, and D2 that you want to separate into pure components (H=1H, and D=2H). If Grahams Law holds, what are the relative rates of these three molecules? Which gas in each of the following pairs diffuses more rapidly, and what are the relative rates of diffusion? (a) Kr or O2 (b) N2 or acetylene C2H2 What are the relative rates of three naturally occurring isotopes of neon, 20Ne, 21Ne, 22Ne. Which has a higher average speed, H2 at 150K or He at 375 C? An unknown gas is found to diffuse through a porous membrane 2.92 times more slowly than H2 gas. What is the molecular weight of the gas? A sample of O2 gas initially at STP is transferred from a 2 L container to a 1 L container at constant temperature. What effect does this change have on (a) the average kinetic energy of O2 molecules; (b) the average speed of O2 molecules (c) the total number of collisions of O2 molecules with the container walls in a unit time? Ideal vs. real Gases Section 10.9 Ideal Gases- follow the KMT 1. 3. 2. 4. Conditions best for Ideal Gases: Real Gases actually have: 1. 2. Conditions where Real Gases deviate from Ideal: When molecules are tightly packed 1. Volume of the gas becomes significant: Ideal Situation Real Situation Predicted Value Actual Value from PV=nRT  2. Gas molecules attract each other and stick together: Ideal Situation Real Situation Predicted Value Actual Value from PV=nRT  Molecules are more likely to deviate when their intermolecular forces are stronger. Real Gases v. Ideal Gases 1. Molecules of an ideal gas are in constant random motion, and are therefore spread far apart. Gases behave in this ideal manner under conditions of ____________ temperature and ____________ pressure. 2. When these conditions are not met, a real gas behaves in non-ideal ways. If the ideal gas equation is used to predict the behavior of a real gas, certain errors may occur. a. The volume predicted by PV = nRT will be too ___________. The reason for this is: b. The pressure predicted by PV = nRT will be too _______. The reason for this is: 3. Which gas in each pair is more likely to deviate from ideal behavior and why? a. H2 and O2 b. N2 and NH3 c. CH4 and PCl3 d. CO2 and SO2 Free Response Practice 1999 A student performs an experiment to determine the molar mass of an unknown gas. A small amount of the pure gas is released from a pressurized container and collected in a graduated tube over water at room temperature. The collection tube containing the gas is allowed to stand for several minutes and its depth is adjusted until the water levels inside and outside the tube are the same. Assume that: The gas in not appreciably soluble in water The gas collected in the graduated tube and water are in thermal equilibrium A barometer, thermometer, balance, and table of equilibrium vapor pressures of water at various temperatures is also available. Write the equations needed to calculate the molar mass of a gas. List the measurements that must be made in order to calculate the molar mass of the gas. Explain the purpose of equalizing the water levels inside and outside the gas collection tube. The student determines the molar mass of the gas to be 64 g/mol. Write the expression (set-up) for calculating the percent error in the experimental value assuming that the unknown gas is butane (molar mass 58 g/mol). Calculations are not required. If the student fails to use information from the table of equilibrium vapor pressures of water in the calculation, the calculated value for the molar mass of the unknown gas will be smaller than the actual value. Explain 1996 D (Required)  Represented above are five identical balloons, each filled to the same volume at 25C and 1.0 atmosphere pressure with the pure gases indicated. (a) Which balloon contains the greatest mass of gas? Explain. (b) Compare the average kinetic energies of the gas molecules in the balloons. Explain. (c) Which balloon contains the gas that would be expected to deviate most from the behavior of an ideal gas? Explain. (d) Twelve hours after being filled, all the balloons have decreased in size. Predict which balloon will be the smallest. Explain your reasoning. 1994 B A student collected a sample of hydrogen gas by the displacement of water as shown by the diagram above. The relevant data are given in the following table. GAS SAMPLE DATAVolume of sample90.0 mLTemperature25CAtmospheric Pressure745 mm HgEquilibrium Vapor Pressure of H2O (25C)23.8 mm Hg(a) Calculate the number of moles of hydrogen gas collected. (b) Calculate the number of molecules of water vapor in the sample of gas. (c) Calculate the ratio of the average speed of the hydrogen molecules to the average speed of the water vapor molecules in the sample. (d) Which of the two gases, H2 or H2O, deviates more from ideal behavior? Explain your answer. 1991 D   An experiment is to be performed to determine the molecular mass of a volatile liquid by the vapor density method. The equipment shown above is to be used for the experiment. A barometer is also available. 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