A mixture of two gases A and B in themole ratio 2 : 3 is kept in a 2 litre vessel. Asecond 3L vessel has the same twogases in the mole ratio 3 5. Both gasmixtures have the same temperature andsame total pressure. They are allowed tointer-mix and the final temperature andthe total pressure are the same as theinitial values, the final volume being 5litres. Given that the molar masses areMA and MB. What is the mean molarmass of the final mixture?

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