Living by Chemistry
Living by Chemistry
2nd Edition
ISBN: 9781464142314
Author: Angelica M. Stacy
Publisher: W. H. Freeman
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Chapter U3.66, Problem 7E
Interpretation Introduction

Interpretation: For 25% humidity and temperature 30 oC, the water vapor density needs to be determined.

Concept Introduction:

The relative humidity is related to water vapor density as follows:

  Relative humidity=Measured water vapor densityMaximum possible water vapor density×100%

Expert Solution & Answer
Check Mark

Answer to Problem 7E

  0.425 moles/1000 L

Explanation of Solution

The maximum water vapor density can be seen from the water vapor density vs. temperature graph.

  Living by Chemistry, Chapter U3.66, Problem 7E

It can be seen from the graph that the water vapor density is approximately 1.7 moles/1000L at 30 oC. This corresponds to 100% humidity.

The relative humidity is related to water density as follows:

  Relative humidity=Measured water vapor densityMaximum possible water vapor density×100%

The given relative humidity is 25% thus,

  25%=Measured water vapor density1.7 moles/1000 L×100%

On rearranging,

  Measured water vapor density=25%×1.7 moles/1000 L100%=0.425 moles/1000 L

Conclusion

Thus, the water vapor density at 30oC is 0.425 moles/1000 L .

Chapter U3 Solutions

Living by Chemistry

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