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20 moles of ideal helium gas are initially at standard temperature and pressure. The gas undergoes...

20 moles of ideal helium gas are initially at standard temperature and pressure. The gas undergoes a change such that the pressure is doubled and the temperature is halved. (a) What is the final volume in cubic meters? (b) lf the mass of a helium atom is 6.69 x 10'27 kg, what is the mean squared speed of the helium atoms in the final state?

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