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Two vessels separately contain two ideal gases A and B at the same temperature, the pressure of A being twice that of B. Under such conditions, the density of A is found to be 1.5 times the density of B. The ratio of molecular weights of A and B is:

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According to the ideal gas equation for one mole,

PV = RT

\(\frac{PM}{ρ} = RT\)

Where ρ is the density and M is the molecular weight of the gas.

M = \(\frac{ρRT}{P}\)

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