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HW1 - gas is to fall to ½ its value in a vertical distance...

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Homework #1 Due Tuesday 1/18 From Raff: 1.2, 1.7, 1.10, 1.12, 1.14, 1.16, 1.17, .28 1. What mass of O 2 gas is present in a 55-Liter flask at 400 o K under 20 atm for a. An ideal gas b. A van der Waals gas 2. Five grams of ethane are confined in a bulb of one-liter capacity. The bulb is so weak that it will burst if the pressure exceeds 10 atm. At what temperature will the pressure of the gas reach the bursting value? 3. For the following mixtures, compute the partial pressure of each gas, the total pressure, and the composition of the mixture in mole percent. a. One gram of N 2 and 1 gram of O 2 are put in a 2 liter flask at 27 o C. b. One gram of H 2 and 1 gram of O 2 are put in a 2 liter flask at 27 o C. Compare both results 4. What would the molecular weight of a gas have to be if the pressure of the
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Unformatted text preview: gas is to fall to ½ its value in a vertical distance of 1m? (T=298K) What types of molecules have molecular weights of this magnitude? 5. Since Julius Caesar expired, his last exhalation has a volume of about 500 cm 3 . This expelled air was 1% in argon. Assume that T= 300 o K, and ground-level P=1atm. Assume that the T and P are uniform over the earth’s surface and still have the same values. If Caesar’s argon atoms have all remained in the atmosphere and have been completely mixed throughout the atmosphere, how many inhalations, 500 cm 3 each, must we make in average to inhale one of Caesar’s argon atoms? (Watch for units!)...
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