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In Langmuir's model of adsorption of a gas on a solid surface
  • a)
    the rate of dissociation of the adsorbed molecules from the surface does not depend on the surface covered.
  • b)
    the adsorption at a single site on the surface may involve multiple molecules at the same time.
  • c)

    the mass of a gas striking a given area of surface is proportional to the pressure of the gas.
  • d)
    the mass of a gas striking a given area of surface is independent of the pressure of the gas.
Correct answer is option 'C'. Can you explain this answer?
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In Langmuirs model of adsorption of a gas on a solid surfacea)the rate...
Assuming the formation of a monolayer of the adsorbate on the surface of the adsorbent.
It was derived by Langmuir, that the mass of the gas adsorbed per gram of the adsorbent is related to the equilibrium pressure according to the equation,

where,
x is the mass of the gas adsorbed on m gm of the adsorbent
P is the pressure
a and b are the constants
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For certain substances such as ammonium chloride, nitrogen peroxide, phosphorus pentachloride, etc. the measured densities are found to be less than those calculatedfrom their molecular formula. The observed densities decrease towards a limit as thetemperature is raised. This is due to the splitting of the molecules into simpler ones. The process is reversible and is called thermal dissociation.Examples :With increase in the number of molecules, the volume increases (pressure remaining constant) and, in consequence, the density decreases. As the temperature rises, more and more dissociation takes place, and when practically complete dissociation occursthe density reaches its lowest limit.The extent of issociation, ice., the fraction of the total number of molecules which suffers dissociation is called the degree of dissociation. Gas density measurements can be used to determine the degree of dissociation. Let us take by general case where one molecule of a substance A splits up into n molecule of B on heating; i.e.,t = 0 at = teq a x nx Total no. of moles Observed molecular weight or molar mass of the mixtureQ.The K for the reaction is 640 mm at 775 K. The percentage dissociation of N2O4 at equilibrium pressure of 160 mm is

For certain substances such as ammonium chloride, nitrogen peroxide, phosphorus pentachloride, etc. the measured densities are found to be less than those calculatedfrom their molecular formula. The observed densities decrease towards a limit as thetemperature is raised. This is due to the splitting of the molecules into simpler ones. The process is reversible and is called thermal dissociation.Examples :With increase in the number of molecules, the volume increases (pressure remaining constant) and, in consequence, the density decreases. As the temperature rises, more and more dissociation takes place, and when practically complete dissociation occursthe density reaches its lowest limit.The extent of issociation, ice., the fraction of the total number of molecules which suffers dissociation is called the degree of dissociation. Gas density measurements can be used to determine the degree of dissociation. Let us take by general case where one molecule of a substance A splits up into n molecule of B on heating; i.e.,t = 0 at = teq a x nx Total no. of moles Observed molecular weight or molar mass of the mixtureQ.If the total mass of the mixture in the above case is 300 gm, the moles at C(g) present are.

For certain substances such as ammonium chloride, nitrogen peroxide, phosphorus pentachloride, etc. the measured densities are found to be less than those calculatedfrom their molecular formula. The observed densities decrease towards a limit as thetemperature is raised. This is due to the splitting of the molecules into simpler ones. The process is reversible and is called thermal dissociation.Examples :With increase in the number of molecules, the volume increases (pressure remaining constant) and, in consequence, the density decreases. As the temperature rises, more and more dissociation takes place, and when practically complete dissociation occursthe density reaches its lowest limit.The extent of issociation, ice., the fraction of the total number of molecules which suffers dissociation is called the degree of dissociation. Gas density measurements can be used to determine the degree of dissociation. Let us take by general case where one molecule of a substance A splits up into n molecule of B on heating; i.e.,t = 0 at = teq a x nx Total no. of moles Observed molecular weight or molar mass of the mixtureQ.A sample of mixture of A(g), B(g) and C(g) under equilibrium has a mean molecular weight (observe d) is 80.The equilibrium is Find the degree of dissociation for A(g).

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In Langmuirs model of adsorption of a gas on a solid surfacea)the rate of dissociation of the adsorbed molecules from the surface does not depend on the surface covered.b)the adsorption at a single site on the surface may involve multiple molecules at the same time.c)the mass of a gas striking a given area of surface is proportional to the pressure of the gas.d)the mass of a gas striking a given area of surface is independent of the pressure of the gas.Correct answer is option 'C'. Can you explain this answer?
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