Topic Content:
- Definition of Ideal Gas
- Deviation of Real Gas from Ideal Gas
- Conditions under which Real Gases Obey the Gas law or Behave Ideally
- Ideal Gas Equation
What is an Ideal Gas?
Ideal gases are gases that obey Boyles’ and Charles law. Real gases do not obey the two laws.
Deviation of Real Gas from Ideal Gas:
1. Real gases occupy space/volume
2. There are forces of attraction between molecules of real gases
3. Real gases liquefy at low temperature and high pressure but according to Charles’ law, ideal gases never liquefy.
Conditions under which Real Gases Obey the Gas law or Behave Ideally:
1. At low pressure.
2. At high temperature.
3. Under laboratory conditions.
Ideal Gas Equation:
The Ideal Gas equation is the combination of Boyle’s law, Charles law and Avogadro’s law.
PV = nRT (Ideal Gas Equation)
P = Pressure, V = Volume, n = no of moles
R = Molar Gas constant
T = Temperature in Kelvin
R = 8.31 JK-1 mol-1 or 0.082 atmdm3 K-1mol-1.
i. 8.31 JK-1mol– is used when pressure is in Pascal or Nm-2 and volume in cm3.
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