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Meteorology. The vapor pressure is the pressure of the

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman ISBN: 9780321675460 31

Solution for problem 88P Chapter 18

University Physics | 13th Edition

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University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

University Physics | 13th Edition

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Problem 88P

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 X 103 Pa. If the air temperature is 20.0o 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 m 3 of air? (The molar mass of water is 18.0 g/mol. Assume that water vapor can be treated as an ideal gas.)

Step-by-Step Solution:

Solution to 88P Step 1 0 3 Vapour pressure of water at T=20 C = 2.34 X 10 Pa 0 Air temperature =20 C =293.15K Relative humidity =60% 3 Volume of air=1m Molar mass of water = 18.0 g/mol Step 2 Partial pressure of water vapour P, P=0.6(2.34 x10 Pa) 3 P=1.4x10 Pa

Step 3 of 3

Chapter 18, Problem 88P is Solved
Textbook: University Physics
Edition: 13
Author: Hugh D. Young, Roger A. Freedman
ISBN: 9780321675460

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