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Chapter 31: Q 101. (page 1256)

A flask contains 1/3 mole of H2 and 2/3 mole of He. Compare the force on the wall per impact of H2 relative to that for He.

Short Answer

Expert verified

Answer: The force exerted on the wall by He is twice than by H2.

Step by step solution

01

Meaning of force

Pressure is defined as the force per unit area.

It means that pressure is directly proportional to the force. If the pressure is increased, more force will be exerted on the walls of the container.

02

Comparison between the forces on the wall per impact of H2 and He

According to Henry鈥檚 law, the partial pressure of gas in the gas mixture is directly proportional to the mole fraction of the gas.

Among the given gas mixture, the mole fraction of He is twice more than that of H2. So, the pressure exerted by the He gas is two times greater than H2.

Hence, the force exerted on the wall will be greater by He than by H2.

The ratio of the impact of the gases is:

H2He=1/32/3=1:2

Therefore, the force exerted on the wall by He is twice than by H2.

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