A 2 L vessel contains 4 g of Helium and 4 g of H₂ gas at 27°C. After sometime, 50% of the gas having higher average speed is

Question

A 2 L vessel contains 4 g of Helium and 4 g of H₂ gas at 27°C. After sometime, 50% of the gas having higher average speed is removed. The percentage reduction in total pressure if temperature remains constant is equal to __

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