Meteorology. The vapor pressure is the pressure of the vapor phase of a substance when it is in equilibrium with the solid or liquid phase of the substance. The relative humidity is the partial pressure of water vapor in the air divided by the vapor pressure of water at that same temperature, expressed as a percentage. The air is saturated when the humidity is 100%. (a) The vapor pressure of water at 20.0°C is 2.34 × 103 Pa. If the air temperature is 20.0°C and the relative humidity is 60%, what is the partial pressure of water vapor in the atmosphere (that is, the pressure due to water vapor alone)? (b) Under the conditions of part (a), what is the mass of water in 1.00 m3 of air? (The molar mass of water is 18.0 g/mol. Assume that water vapor can be treated as an ideal gas.)
Want to see the full answer?
Check out a sample textbook solutionChapter 18 Solutions
University Physics with Modern Physics (14th Edition)
Additional Science Textbook Solutions
Biology: Life on Earth with Physiology (11th Edition)
Campbell Biology (11th Edition)
Chemistry: A Molecular Approach (4th Edition)
Campbell Essential Biology with Physiology (5th Edition)
Applications and Investigations in Earth Science (9th Edition)
Organic Chemistry (8th Edition)
- (a) An ideal gas occupies a volume of 1.0 cm3 at 20.C and atmospheric pressure. Determine the number of molecules of gas in the container, (b) If the pressure of the 1.0-cm3 volume is reduced to 1.0 1011 Pa (an extremely good vacuum) while the temperature remains constant, how many moles of gas remain in the container?arrow_forwardCylinder A contains oxygen (O2) gas, and cylinder B contains nitrogen (N2) gas. If the molecules in the two cylinders have the same rms speeds, which of the following statements is false? (a) The two gases haw different temperatures. (b) The temperature of cylinder B is less than the temperature of cylinder A. (c) The temperature of cylinder B is greater than the temperature of cylinder A. (d) The average kinetic energy of the nitrogen molecules is less than the average kinetic energy of the oxygen molecules.arrow_forwardA cylinder with a piston holds 0.50 m3 of oxygen at an absolute pressure of 4.0 atm. The piston is pulled outward, increasing the volume of the gas until the pressure drops to 1.0 atm. If the temperature stays constant, what new volume does the gas occupy? (a) 1.0 m3 (b) 1.5 m3 (c) 2.0 m3 (d) 0.12 m3 (e) 2.5 m3arrow_forward
- On a hot summer day, the density of air at atmospheric pressure at 35.0C is 1.1455 kg/m3. a. What is the number of moles contained in 1.00 m3 of an ideal gas at this temperature and pressure? b. Avogadros number of air molecules has a mass of 2.85 102 kg. What is the mass of 1.00 m3 of air? c. Does the value calculated in part (b) agree with the stated density of air at this temperature?arrow_forwardAt what temperature is the average speed of carbon dioxide molecules ( M=44.0 g/mol) 510 m/s?arrow_forwardA gas is at 200 K. If we wish to double the rms speed of the molecules of the gas, to what value must we raise its temperature? (a) 283 K (b) 400 K (c) 566 K (d) 800 K (e) 1 130 Karrow_forward
- At the end of a warm autumn day, you measure the air pressure in your car's tires and write down their pressure as 2.41 × 105 Pa (about 35 psi) when the outside temperature is 23°C. It cools down quite a bit overnight to -5°C. If you were to measure the air pressure in the tire on that cool morning, what pressure would you measure? Assume that you can ignore the change in the volume of the tire and that no air is released from the tire overnight.arrow_forwardOn Mars, the atmosphere is composed mainly of carbon dioxide. The value of the gas constant for the Martian atmosphere is 192 J/kg-K, and the acceleration of gravity there is 3.72 m/s?. At the average level of the Martian surface, the average temperature is 230 K, the pressure is 790 N/m?. At a certain altitude, the pressure is 680 N/m? and the average temperature is 203 K. 6. The temperature lapse rate is: A) – 0.01613 K/m B) – 0.1613 K/m C) – 1.613 K/m D) None of the above 7. The altitude is: A) 1200 m B) 1675 m C) 1765 m D) None of the abovearrow_forwardProblem 6: Suppose a 26.5°C car tire contains 3.5 mol of gas in a 32.5 L volume. Part (a) What is the gauge pressure, in atmospheres, in the car tire? Pg1 = Part (b) What will the gauge pressure be if you add a quantity of gas that had a volume of 2.00L when it was at atmospheric pressure and the same temperature as the tire? Assume the temperature returns to 26.5°C and the volume remains constant.arrow_forward
- An air bubble has a volume of 1.55 cm3 when it is released by a submarine 105 m below the surface of a lake. What is the volume of the bubble when it reaches the surface? Assume the temperature and the number of air molecules in the bubble remain constant during its ascent.arrow_forwardProblem 8: A bicycle tire has a pressure of 6.85 × 105 Pa at a temperature of 19°C and contains 2.00 L of gas. What will its pressure be, in pascals, if you let out an amount of air that has a volume of 105 cm3 at atmospheric pressure and at the temperature of the tire? Assume tire temperature and volume remain constant.arrow_forwardAn automobile engine works by injecting a fuel and air mixture into a cylinder with a piston. Once this mixture is injected, the piston compresses the mixture by a factor of 9, meaning that the volume is reduced by 1/9. Assume that the initial temperature is 25°C. Assume that the initial pressure is 1.00 atmospheres and the final pressure is 21.7 atmospheres. Treat the air-fuel mixture as an ideal gas. What is the temperature of the compressed mixture? A 723 K 745 K C 719 K 333 Karrow_forward
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
- College PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningCollege PhysicsPhysicsISBN:9781285737027Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningAn Introduction to Physical SciencePhysicsISBN:9781305079137Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar TorresPublisher:Cengage Learning