The van der Waal's equation for (1/2) mole of a gas — States of Matter and Gaseous State Chemistry Question

💡 Solution & Explanation

The general van der Waals equation is $(P + an^2/V^2)(V - nb) = nRT$. Substituting $n = 1/2$ yields $(P + a(1/2)^2/V^2)(V - (1/2)b) = (1/2)RT$, which correctly simplifies exactly to the expression in option B. Therefore, correct answer is B.