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In the van der Waals equation of state for a gas, the constant 'b' represents the measure of

1. the space occupied by the gas molecules
2. attractive forces between molecules
3. repulsive forces between molecules
4. collisions between molecules per unit volume

Correct answer: the space occupied by the gas molecules

Solution

The constant 'b' in the van der Waals equation accounts for the volume occupied by the gas molecules themselves, reflecting the finite size of the particles and thus adjusting the ideal gas behavior to more accurately represent real gases.

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