   Chapter 10, Problem 93GQ

Chapter
Section
Textbook Problem

Relative humidity is the ratio of the partial pressure of water in air at a given temperature to the vapor pressure of water at that temperature. Calculate the mass of water per liter of air under the following conditions: (a) at 20 °C and 45% relative humidity (b) at 0 °C and 95% relative humidity Under which circumstances is the mass of H2O per liter greater? (See Appendix G for the vapor pressure of water.)

(a)

Interpretation Introduction

Interpretation:

The mass of water vapor present in the under given set of conditions and the under with condition the mass of water vapor is greater should be determined.

Concept introduction:

Arrhenius equation:

• Arrhenius equation is a formula that represents the temperature dependence of reaction rates
• The Arrhenius equation has to be represented as follows

k=AeEa/RTlnk=lnAeEa/RTlnk=(EaR)(1T)+lnA

• Ea represents the activation energy and it’s unit is kJ/mol
• R represents the universal gas constant and it has the value of 8.314 J/K.mol
• T represents the absolute temperature
• A represents the frequency factor or collision frequency
• e represents the base of natural logarithm
•  Arrhenius equation equation was proposed by Svante Arrhenius in 1889.
Explanation

Given:

percentage of humidity = 45%Temperature = 20C = 273.15+23= 293.15KVolume = 1L

Using the ideal gas equation the mass present in the given amount of humidity is determined as follows,

It is given in appendix that the vapor pressure of water at given 20 is 17.5torr

Partial pressure = vapor pressure × relative humidity=17

(b)

Interpretation Introduction

Interpretation:

The mass of water vapor present in the under given set of conditions and the under with condition the mass of water vapor is greater should be determined.

Concept introduction:

Arrhenius equation:

• Arrhenius equation is a formula that represents the temperature dependence of reaction rates
• The Arrhenius equation has to be represented as follows

k=AeEa/RTlnk=lnAeEa/RTlnk=(EaR)(1T)+lnA

• Ea represents the activation energy and it’s unit is kJ/mol
• R represents the universal gas constant and it has the value of 8.314 J/K.mol
• T represents the absolute temperature
• A represents the frequency factor or collision frequency
• e represents the base of natural logarithm
•  Arrhenius equation equation was proposed by Svante Arrhenius in 1889.

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