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The following problems are due next week but you should work on them with your group today. 4.(20pts) Valves closed He (ideal
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Answer #1

The no. of moles of He-gas = PV/RT = 442*3.5/62.364T = 24.806/T mol

The no. of moles of Ne-gas = 640*6.85/62.364T = 70.297/T mol

Mole fraction of He-gas = 24.806/(24.806+70.297) = 0.261

Mole fraction of Ne-gas = 1-0.261 = 0.739

Now, partial pressure He-gas = 442 torr * 0.261 = 115.3 torr

And the partial pressure of Ne-gas = 640 torr * 0.739 = 473.1 torr

Therefore, the final total pressure = 115.3 + 473 = 588.4 torr

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