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Why excluded volume v is four times the ...

Why excluded volume v is four times the actual volume of molecules?

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In the van der Waals equation (P + (n^(2)a)/(V^(2)))(V - nb) = nRT the constant a reflects the actual volume of the gas molecules.

CENGAGE CHEMISTRY ENGLISH-STATES OF MATTER-Exercises (Ture False)
  1. All the molecules in a given sample of gas move with same speed.

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  2. Small value of a means, gas can be easily liqueifed.

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  3. Small value of a means, gas can be easily liqueifed.

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  4. Rate of diffusion is directly proportional to the square root of molec...

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  5. For ideal gases, Z = 1 at all temperature and pressure.

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  6. According to charles's law,

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  7. The pressure of moist gas is higher than pressure of dry gas.

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  8. Gases do not occupy volume and do not have force of attraction.

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  9. The van der Waal equation of gas is (P + (n^(2)a)/(V^(2))) (V - nb)...

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  10. Surface tension and surface energy have different dimensions.

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  11. The plot of PV vs P at particular temperature is called isovbar.

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  12. Give reasons for the following in one or two sentences. (a) A bottle...

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  13. Can a gas with a = 0 be liquefied?

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  14. The van der waals constants have same values for all the gases.

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  15. All the molecules in a given sample of gas move with same speed.

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  16. The observed pressure of real gas is more than the ideal pressure.

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  17. Heat capacity of a diatomic gas is higher than that of a monoatomic ga...

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  18. Dry O(2) is heavier than moist O(2).

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  19. Why excluded volume v is four times the actual volume of molecules?

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  20. The gas above T(c ) cannot be liquefied.

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