Question

1. A mole of neon has a mass of about 20 g whereas a mole of argon has a mass of about 40 g. If a container at 300 K contains a mole of each gas

a) which particles (on average) are moving faster?

b) does the ratio of the faster particles to the slower particles equal 2, 4, or (square root 2) Explain.

2. A quarter of a mole of neon gas is in equilibrium at 300 K in a container that has a volume of 5.0 L.

a) How many atoms of neon would you expect to find in one portion of the container that has a volume of 1.0 L? Explain your answer in terms of the definition of equilibrium given in our study of entropy,

b) if the container is heated so that the gas reaches a temperature of 330 K, what is the change in entropy of the system? Assume that the expansion of the container is negligible.

3. a) In an experiment with sound waves in a tube, one group of students found resonant frequencies at 540 Hz, 720 Hz, and 900 Hz. What is likely the fundamental frequency of this series? List at least one other resonant frequency they should be able to find.

b) Another group of students is also experimenting with sound waves in the same length tube and finds resonance at 270 Hz, 450 Hz, and 630 Hz. One student in the group says that the fundamental frequency is 180 Hz but another argues that it is only 90 Hz. Who is right? explain how you know

c) What is the difference between these two groups experimental setup? That is why are the frequencies they are finding not the same given that they are using tubes that are the same length?

Answer 1