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Chapter 5: Q5.10P (page 227)

In Figure P5.10, what is the pressure of the gas in the flask (in atm) if the barometer reads 738.5 torr?

Short Answer

Expert verified

The pressure of the gas is 0.941 atm.

Step by step solution

01

Total pressure

Total pressure is the sum of the pressure of the atmosphere and the difference in heights of the columns.

02

Determination of pressure of the gas

Convert the total pressure from torr to mmHg.

    1 torr = 1 mmHg⇒738.5 torr = 738.5 mmHg

Convert cmHg to mmHg

  1 cmHg = 10 mmHg⇒2.35 cmHg = 23.5 mmHg

Now, the pressure of the gas is,

Ptotal=∆h+PgasPgas = Ptotal  -∆h= 738.5 mmHg - 23.5  mmHg=  715 mmHg

Now, convert the pressure of the gas from mmHg to atm,

1 atm = 760 mmHg

715 mmHg  ×1 atm760  mmHg = 0.941 atm

Thus, the pressure of the gas is 0.941 atm.

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Most popular questions from this chapter

Are the particles in a gas farther apart or closer together than the particles in a liquid? Use your answer to explain each of the following general observations:

(a) Gases are more compressible than liquids.

(b) Gases have lower viscosities than liquids.

(c) After thorough stirring, all gas mixtures are solutions.

(d) The density of a substance in the gas state is lower than in the liquid state.

A student states Boyle’s law as follows: “The volume of a gas is inversely proportional to its pressure.” How is this statement incomplete? Give a correct statement of Boyle’s law.

To collect a beaker of H2 gas by displacing the air already in the beaker, would you hold the beaker upright or inverted? Why? How would you hold the beaker to collectCO2 ?

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.

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

(a) The pressure is tripled (at constantT).

(b) The absolute temperature is increased by a factor of 3.0 (at constantP).

(c) Three more moles of the gas are added (at constant P and T).
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