Week 13 Homework Assignment

1. (P.467 Prob.2) The temperature at which liquid nitrogen boils (at atmospheric pressure) is 77K. Express this temperature in (a) °C and (b) °F.
2. (P.468 Prob.6) A lead rod and a common lass rod both have the same length when at 20.0°C. The lead rod is heated to 50.0°C. To what temperature must the glass rod be heated so that they are again at the same length?
3. (P.467 Prob.24) At 0.0°C and 1.00atm, 1.00 mol of a gas occupies a volume of 0.0224m³. (a) What is the number density? (b) Estimate the average distance between the gas molecules. (c) If the gas is nitrogen (N₂), the principal component of air, what is the total mass and mass density
4. (P.469 Prob.34) Incandescent lightbulbs are filled with an inert gas to lengthen the filament life. With the current off (at T = 20.0°C), the gas inside a lightbulb has a pressure of 115kPa. When the bulb is burning, the temperature rises to 70.0°C. What is the pressure of the higher temperature?
5. (P.469 Prob.46) A tank of compressed air of volume 1.0m³ is pressurized to 20.0atm at T = 173K. A valve is opened and air is released until the pressure in the tank is 15.0atm. How many air molecules were released?
6. (P.469 Prob.56) A smoke particle has a mass of 1.38 x 10^-17kg and it is randomly moving about in thermal equilibrium with room temperature air at 27°C. What is the rms speed of the particle?