1.)   A glass bulb contains 250 grams of nitrogen gas at a temperature of 80oC and at a pressure of 3.5 atm. If the glass bulb is cooled to 20oC and an additional of 85 grams of N2 gas was required to fill the bulb, calculate the pressure of the gas in the bulb after cooling.   2.)   The best laboratory pump can generate a vacuum of about 1 nTorr. At 25oC and assuming that air consists of nitrogen gas molecules with a collision diameter of 395 pm, calculate (a) the mean speed of the molecules, b) the mean free path, c) the collision frequency.

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