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__PART A__

To calculate the total pressure we simply get the sum of the partial pressures.

A 2.45-L flexible flask at 15°C contains a mixture of N_{2}, He, and Ne at partial pressures of 0.283 atm for N_{2}, 0.151 atm for He, and 0.425 atm for Ne.

(a) Calculate the total pressure of the mixture in atm.

(b) Calculate the volume in liters at STP occupied by He and Ne if the N _{2} is removed selectively.

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