
Interpretation:
The SF6 gas behaves more ideally at 150 °C or at 20 °C is to be explained.
Concept introduction:
Gases that obey the ideal gas equation at all temperature and pressure are known as ideal gas.
The ideal gas equation can be expressed as follows,
PV=nRT
Here, P is the pressure, V is the volume, T is the temperature, n is the mole of the gas and R is the gas constant.
The expression of van der Waals equation is as follows:
(P+n2aV2)(V−nb)=nRT
Here, P is the pressure, V is the volume, T is the temperature, n is the mole of the gas, R is the gas constant, a and b are van der Waals constants.
The van der waals constants are depends upon the nature of gas, The value of a is greater than b.
At low pressure and high temperature, real gas will obey the gas laws.
The compressibility factor equation can be given as follows:
Z=PVRT
Here, P is the pressure, V is the volume, T is the temperature, Z is the compressibility factor, n is the mole of the gas and R is the gas constant.
Z=1, that means gas shows ideal behaviour at all temperature and pressure.
At high pressure, Z>1, the gas has less compressibility and more replusive force between the gas molecule. It shows positive deviation from ideal behaviour.
At low pressure, Z<1, the gas has high compressibility and more attractive force between the gas molecules. It shows negative deviation from ideal behaviour.

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Chapter 5 Solutions
Connect 2-Year Access Card for Chemistry: The Molecular Nature of Matter and Change
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