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## Homework Statement

Why 'vd ∝ d' in Pv = nRT? Should it be 'vd ∝ d⁄2'? (where vd = vapour density)

## Homework Equations

## The Attempt at a Solution

As we know Pv = nRT, PM = dRT, PM / 2 = dRT / 2, M / 2 = d / 2, vd ∝ d (as given by the book) but my question is it should be 'vd ∝ d / 2' as denominator 2 is remeaning.