For a real gas obeying van der Waals' equation, a graph is plotted between PVm (y-axis) and P(x-axis) where Vm is the molar volume. Find the y-intercept of the graph.
Correct answer: A. RT
- A. RT
- B. a/Vm
- C. b
- D. Cannot be determined
Explanation
For a real gas obeying van der Waal's equation, a graph is plotted between PVm (y-axis) and P (x-axis), where Vm is molar volume. The y-intercept of the graph is RT. This means that when the pressure of the gas is zero, the molar volume of the gas is equal to RT/P, where R is the gas constant and T is the temperature in Kelvin.
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About Gases
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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