Vander Waal's equation for CH4 at low pressure is:
Correct answer: A. P(Vm −b)=RT
- A. P(Vm −b)=RT
- B. (P+a/V2m)Vm =RT
- C. PVm=RTP
- D. (P−b)(Vm −a/V2m)=RT
Explanation
The Van der Waals equation simplifies by dropping the pressure correction term but keeping the volume correction term, which means:Pressure behaves ideally (no correction needed).Volume available for the gas is reduced by the molecular volume bThis reflects that the gas behaves almost ideally, except that the effective volume is slightly less due to the space occupied by the methane molecules.
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Gas behaviour is explained through the kinetic molecular theory and the relationships among pressure, volume and temperature. Work includes STP, Boyle's and Charles's laws, absolute zero, the ideal gas equation, and the distinction between ideal and real gases, especially the effects of intermolecular forces and molecular volume.
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