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Chapter 5: Q5.34P (page 228)

Why is moist air less dense than dry air?

Short Answer

Expert verified

The density of moist air is less than dry air because moist air has a lower molecular mass.

Step by step solution

01

Dry air and moist air

Dry air is the combination of approx. 78% nitrogen (molecular mass is28 g/mol ) and 21% oxygen (molecular mass is 32 g/mol).

Moist air consist of water vapour and its molecular mass is 18 g/mol.

Therefore, the mass of moist air is very less than that of dry air.

02

Density of moist air and dry air

The density is the ratio of mass to the volume.

It means that, if the mass is greater, density will be greater and vice versa.

As the mass of moist air is less than the mass of dry air.

Thus, the density of moist air is less than that of dry air.

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Most popular questions from this chapter

What is the effect of the following on the volume of 1 mol of an ideal gas?

(a) The pressure is reduced by a factor of 4 (at constantT).

(b) The pressure changes from 760 torr to 202 kPa, and the temperature changes from 37°Cto 155 K.

(c) The temperature changes from 305 K to 32°C, and the pressure changes from 2 atm to 101 kPa.

Convert the following:

(a) 76.8 cmHg to atm (b) 27.5 atm to kPa

(c) 6.50 atm to bar (d) 0.937 kPa to torr

How does a barometer work? Is the column of mercury in a barometer shorter when it is on a mountaintop or at sea level? Explain.

What is the effect of the following on the volume of 1 mol of an ideal gas?

(a) Half the gas escapes (at constantPandT).

(b) The initial pressure is 722 torr, and the final pressure is 0.950 atm; the initial temperature is 32oF, and the final temperature is 273 K.

(c) Both the pressure and temperature decrease to one-fourth of their initial values.

What is the effect of the following on the volume of 1 mol of an ideal gas?

(a) Temperature decreases from 800 K to 400 K (at constantP).

(b) Temperature increases from 250°Cto 500°C(at constantP).

(c) Pressure increases from 2 atm to 6 atm (at constant T).
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