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(A) According to Langmuir's model of adsorption,the rate of adsorption is proportional to the pressure of the gas $(p)$ and the number of vacant sites

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the mass of gas striking a given area of surface is proportional to the pressure of the gas

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(A) According to Langmuir's model of adsorption,the rate of adsorption is proportional to the pressure of the gas $(p)$ and the number of vacant sites on the surface.The mass of gas striking a given area of surface is directly proportional to the pressure of the gas $(p)$ because the frequency of molecular collisions with the surface increases linearly with pressure.Therefore,the correct statement is that the mass of gas striking a given area of surface is proportional to the pressure of the gas.

In Langmuir's model of adsorption of a gas on a solid surface:

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