The unit for Van der Waals constant 'b' is?
Correct answer: C. m3 mol-1
- A. mol dm-3
- B. dm3
- C. m3 mol-1
- D. m3 mol
Explanation
Option A: This unit represents the concentration of a substance in moles per cubic decimeter. It is commonly used to express the concentration of a solution. However, the Van der Waals constant 'b' does not have this unit. Option B: This unit represents volume in cubic decimeters, which is equivalent to liters. It is often used to measure the volume of a substance. However, the Van der Waals constant 'b' is not expressed in this unit. Option C: This unit represents the inverse of molar volume. It indicates the volume occupied by one mole of a substance. The Van der Waals constant 'b' has this unit because it represents the volume excluded by one mole of a substance in the Van der Waals equation. Option D: This unit represents the product of volume and amount of substance. However, the Van der Waals constant 'b' does not have this unit.
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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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