# Chemistry lab worksheet

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I just posted the simulation for this weeks lab Behavior of Gases SIMULATION Please print it off, follow the directions and answer the questions. ( please label every question and answer them In order so I can follow them as well. please use word for answers including tables and graphs if found)

mickeygabz
School: Cornell University

See attached

NAME:_______________________
DATE:_______________________
LAB INSTRUCTOR:_______________________

Lab Exercise 11 - Simulation
Behavior of Gases: Finding the Molar Mass of a Fictitious
Gas Using Temperature and Average Velocity
OBJECTIVES

• Determine the molar mass of a fictitious gas in a simulation
• Learn the relationship between temperature and kinetic energy
INTRODUCTION

The molecules of matter at ordinary temperatures can be considered to be in ceaseless,
random motion at high speeds. The average translational kinetic energy for these molecules
can be deduced from the Boltzmann distribution. Knowing the velocity and the temperature of
these molecules at different temperatures will allow us to calculate a value for the Molar Mass.
The Boltzmann distribution of energies can be broken down to relate average velocities to
temperature using the following relation:

kT = mv2

k = 1.38 x 10-23 J/K
T in Kelvin
m of a single particle in kg
v in m/s

We can eliminate the 1/2 factor by multiplying both sides by 2 giving us:

3kT =mv2
y = mx + b
You can see how this equation can be viewed and plotted as a linear relationship with v2 as the
x-axis and 3kT as the y-axis.
PROCEDURE

A. Go to the University of Colorado website for science simulations: phet.colorado.edu.
1. Click on the “Play with Simulation” button.
2. Click on “Chemistry”
3. Find the lab the says “Gas Properties” and click on it.

Page 1 of 5

4. You can either use the simulation online or download it as a .jar (Java archive) file. If you
click to play and you get a blank screen, you will need to download it.
5. Open the .jar file and run it. If you need to install Java on your computer you can do so
after installing. You may also get a message about the developer and it won’t open. If
this happens, just hold down Control and click to open the file, then open it.

B. SETTING UP THE EXPERIMENT
1. Click on “Volume” as your Constant Parameter.
2. Click on “Measurement Tools”, then select “Species Information”
3. Click on “Advanced Options” and deselect “Molecules Collide”
4. Record your data from the experiment in the table below for Temperature, Pressure, and
Heavy Species

T(k)

Pressure (atm)

Average Speed(m/s)

554

300

1.08

476.48

554

100

0.36

275.04

554

200

0.72

388.56

554

500

1.81

614.92

554

700

2.53

727.99

Light Species

T(k)

Pressure (atm)

Average Speed(m/s)
...

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Anonymous
Top quality work from this guy! I'll be back!

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