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States of Matter

Short Answer Type

31.

Write an equation which is used to calculate kinetic energy from the values of pressure and volume.

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32.

Define Boltzman constant.

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33.

Give the numerical value of Boltzmann constant.

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34.

When do gases deviate more from the ideal behaviour?

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35.

What is Boyle's Temperature?

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36.

What is compressibility factor? What is its value for an ideal gas?

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37.

Write vander Waals equation for n moles of a gas.

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38.

Explain the physical significance of van der Waals parameters.

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39. Critical temperature for carbon dioxide (CO₂) and methane (CH₄) are 31·1°C and –81 ·9°C respectively. Which of these has stronger intermolecular forces and why?

We know that higher the critical temperature, more easily the gas can be liquefied i.e. greater are intermolecular forces of attraction. This means that the intermolecular forces of attraction between the molecules of a gas are directly proportional to its critical temperature. Since CO₂ has greater critical temperature than CH₄, therefore CO₂ has stronger intermolecular forces than CH₄.

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