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Calculate the partial pressure. Calculate the total pressure and volume in liters at STP of Nitrogen, Helium and Neon mixture.

A mixture of gases contains 0.31 mol CH₄ 0.25 mol C₂H₈. The total pressures of the gases. A 2.5L flask at 15°C contains a mixture of N₂ 0.15 atm for He, and 0.42 atm for Ne.
(a) Calculate the total pressure of the mixture.
(b) Calculate the volume in liters at STP occupied by He and Ne if the N₂ is removed selectively.

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