Vander Waal's equation for CH4 at low pressure is:
Correct answer: B. Option B
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation
At low pressure P, volume V is high. V-b will approximately be equal to V so b is neglegibe. Put this in real gas equation to obtain the final equation. This working is shown below.
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About Real and Ideal Gases
An ideal gas is modelled as particles with negligible volume and no intermolecular attraction, obeying Boyle's, Charles's and Avogadro's laws through PV = nRT. Real gases deviate from this behaviour, especially at high pressure and low temperature, because particle volume and attractive forces matter; the van der Waals equation explains these corrections.
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