HW07 - Chemistry 111 Homework#7 Due(Wednesday 1 A sample of...

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Chemistry 111 Homework #7 Due: October 19, 2005 (Wednesday) 1. A sample of carbon dioxide gas (CO 2 ) is placed in a small 450 mL flask, with very strong walls, under a pressure of 10.0 atm at -11°C. What is the mass of CO 2 in that flask? a) 9,205 g b) 12.5 g c) 9.20 g d) 8.49 g e) 219 g f) None of these. 2. A particular experiment calls for CO 2 gas with a density of 4.32 g/L at a pressure of 3.23 atm. What will be the temperature for the sample of CO 2 gas that has this density and pressure? a) 128°C b) 401°C c) 674°C d) 25°C e) 263°C f) 225°C 3. An unknown gas has a density of 2.59 g/L at STP. Identify the gas. a) NO 2 b) O 2 c) CO 2 d) CO e) C 2 H 6 f) C 4 H 10 4. How many of the following are properties of an ideal gas? Type your numerical answer in Blackboard. 1. It consists of particles that have no volume. 2. It consists of particles that have neither attractive nor repulsive forces for each other. 3. It is made up of particles that are in constant, random motion. 4. It can be readily liquefied at high pressures and low temperatures. 5. It obeys PV = nRT. 5. According to the postulates of the kinetic molecular theory of gases, the average speed of the molecules in a given gas is proportional to the… a) absolute temperature squared. b) absolute temperature. c) reciprocal of the absolute temperature. d) Celsius temperature squared. e) the square root of the absolute temperature. f) None of these.
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Chemistry 111 2 Homework #7 / Fall 2005 6. Consider the following reaction… N 2 (g) + 3 H 2 (g) 2 NH 3 (g) How many liters of NH 3, measured at 100°C and 725 torr, can be produced from 25.0 L of H 2 measured at 300°C and 525 torr? a) 11.8 L b) 11.0 L c) 4.75 L d) 7.13 L e) 7.86 L f) None of these. 7. The decomposition of sodium azide (NaN 3 ) at high temperatures produces nitrogen gas (N 2 ). Together with the necessary devices to initiate the reaction and trap the sodium metal formed, this reaction is used in air-bag safety systems in automobiles (wow! you learn something new every day, if you're not careful!). What volume of nitrogen gas, measured at 735 torr and 26°C, is produced when a 70.0 g sample of NaN 3 (MW = 65.01) is decomposed? 2 NaN 3 (s) 2 Na (l) + 3 N 2 (g) a) 82.0 L b) 19.0 L c) 3.58 L d) 41.1 L e) 27.3 L f) None of these. 8. Given a cylinder of fixed volume filled with two moles of argon gas at 25°C, how many of the following statements are correct? Type your numerical answer in Blackboard. 1. If the temperature of the cylinder is changed from 25°C to 50°C, the pressure inside the cylinder will double. 2. If a third mole of argon is added to the cylinder, the ratio of T/P will remain unchanged. 3. A cylinder of identical volume filled with the same pressure of helium at the same temperature must contain the same number of atoms as in the Ar cylinder. 4. The cylinder filled with He (described in the third statement) has faster moving atoms (on the average).
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Chemistry 111 3 Homework #7 / Fall 2005 9. When ozone (O 3 ) is placed in contact with dry, powdered KOH at –15°C, a red-brown solid potassium ozonide (KO 3 ) forms, according the following equation.
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HW07 - Chemistry 111 Homework#7 Due(Wednesday 1 A sample of...

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