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Chapter 8: Problem 51

Molecular mass of dry air is (a) less than moist air (b) greater than moist air (c) equal to moist air (d) may be greater or less than moist air

Short Answer

Expert verified
Question: Comparing the molecular masses, dry air is _____ than moist air. Answer: greater

Step by step solution

01

Determine the Molecular Mass of Dry Air Components

Dry air is composed primarily of nitrogen (N2) with a molecular mass of 28, oxygen (O2) with a molecular mass of 32, and a few other trace gases. The molecular mass of dry air is approximately the weighted average of these components considering their respective percentage concentrations in the air.
02

Determine the Molecular Mass of Water Vapor

Water vapor (H2O) has a molecular mass of 18, which is lower than both nitrogen and oxygen.
03

Compare Molecular Masses of Dry Air and Moist Air

Since dry air is composed of gases with molecular masses higher than water vapor, when we introduce water vapor into the air (creating moist air), the overall molecular mass will decrease due to lower molecular mass of water vapor diluting the overall molecular mass of the air mixture.
04

Select the Correct Option

Based on our analysis, the molecular mass of dry air is greater than that of moist air. Therefore, the correct answer is: (b) greater than moist air

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Most popular questions from this chapter

A quantity of \(10 \mathrm{~g}\) of acetic acid is dissolved in \(100 \mathrm{~g}\) of each of the following solvents. In which solvent, the molality of solution is maximum? Assume no any dissociation or association of acetic acid in the solvent. (a) Water (b) Ethanol (c) Benzene (d) Same in all solvents

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