Physical Chemistry 1st Midterm Test 2016上.pdf

Physical Chemistry 1st Midterm Test 2016上.pdf - Physical...

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Physical Chemistry 1 st Midterm Test (2016/10/15) 1. Please write explain of noun (15 points) a. Maxwell-Boltzmann distribution of speeds b. The mean free path c. Boyles’s law d. The internal energy of monatomic molecular e. Isothermal reversible expansion 2. The density of a gaseous compound was found to be 1.23 kg m -3 at 330K and 20 kPa. What is the molar mass of the compound? (5 points) 3. The composition of the atmosphere is approximately 80% N 2 and 20% O 2 by mass. At what height above the surface of the earth would the atmosphere become 90% N 2 and 10% O 2 by mass? (Hint: using barometric formula RT hMg e p p 0 , p: pressure, h: height, M: molecular weight, g: 9.8 m/s 2 ) (8 points) 4. a. Calculate the root mean square speeds of CO 2 molecules and He atoms at 20 o C. (hint: v rms = M RT 3 ) (4 points) b. Use the Maxwell-Boltzmann distribution of speeds to estimate the fraction of CO 2 molecules at 400K that have speeds in the range from 400 to 405 m/s.
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