W3-Problem Set 

NSTRUCTIONS.

• QUESTIONS

A MONOATOMIC ideal gas at 295 degrees Kelvin  initially occupies 0.150 cubic meters at a pressure of 2.00 atmospheres.
 (a) How many moles of the gas are there (HINT: convert to correct units first)
        The gas then undergoes two steps:
        Step 1: expands at constant pressure until volume doubles.
        Step 2: expands isothermally so volume doubles AGAIN (so final volume is 4 TIMES initial volume).
 (b) After Step 1, what is the temperature of the gas?
 (c) What is the total work done at the end of the two steps. 

• Load up this Desmos on Maxwell Speed Distribution (Links to an external site.).
  (a) Change the molar mass (M) value to be that for F2 gas. (google it! the current value is for 02 in units of kg/mol)
  (b) Find the temperature at which the average speed is 700 meters per second.
  **You may need to change the range of allowed values of T on Desmos for this**
  For the temperature your found in (b):
  (c) What are the most probable and RMS?
  (d) What is the probability that the speed of an F2 molecule is greater than rms speed?
  (f) if I wanted to cut the average speed in half, what temperature do I need?

The volume of an ideal gas is adiabatically reduced from 200 L to 74.3 L.
The initial pressure and temperature are 1.00 atm and 300 K.
The final pressure is 4.00 atm.
(a) Is the gas monatomic, diatomic, or polyatomic?
(b) What is the final temperature?
(c) How many moles are in the gas?

At the end of the Adiabatic Processes video (Links to an external site.) there is an example question. Do it!

W3-Drawing Activity

• Instructions:

Sketch some processes in three pV diagrams.

For each diagram it just has to to look qualitatively correct. No numbers or calculations are needed.

• sketch all 3 diagrams on 1 piece of paper (or 1 screen) and take a picture/screenshot and upload.

Label each process on the diagrams (i.e. label the isothermal, label the constant p...)

Please make sure it's written on a notebook and show work.

Sketch 1: Two processes

First is a constant volume process where the pressure is reduced

Second is an isothermal expansion.

Sketch 2: Three processes

First is a constant pressure volume reduction

Second is an adiabatic expansion

1. Third is an isothermal expansion

Sketch 3: Four processes in a CLOSED LOOP

choose 4 processes that can form a close loop (i.e. it ends up where it started)

https://youtu.be/6TB1y1KLp3I