
Read the Lab Procedure. What is the
objective of today’s lab in your own words?

On a phase diagram, what do the “plateaus”
indicate? What do the slopes indicate?


Review Graham’s WS
Review
▪ Calculate the molar volume of a gas
using experimental data
▪ Demonstrate my knowledge of gas
laws by completing an assessment.




Pass fwd Practice Problems
Lab
You will have 15 minutes during lab to work
on HW – gas law problems
Reminder: Test on Wed or Th




Wear goggles and aprons
Working with 3 M HCl – wash with water for 5
minutes if you get on skin
Liquids can be put down the drain
Demo – need to be very careful this lab. Any
horsing around, you will be removed!!
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Brooke, Mira
Sophia, Brendan
Maddie, Emily
Adam, Niijae
Garrett, Harper
Kristine, Devin
Meghan, Ergi
Eli, Alayna
Clay, Thomas
Michael, Paulos
Sophia, Cade
Travis, Maria
1.
What is the mass of the magnesium strip
you used?
2.
How many moles of magnesium does this
represent?
1. How can we complete this conversion?
3.
How many moles of hydrogen should be
produced in the reaction?
▪
▪
▪
Note: We are assuming all of the Magnesium was consumed
Hint: What is the balanced equation for the reaction that we ran
in lab?
Using that information how could we determine the number of
moles of hydrogen?
4. What is the vapor pressure of water under
the conditions of this experiment?
▪
▪
Vapor pressure can be looked up using a table of values
at a given temperature.
PH2O = 20.0 mmHg
5. What is the pressure of JUST hydrogen gas?
▪
Ptotal = PH2O + PH2
6. What would the volume of this gas be at
STP?
 Use the combined gas law
 What was the pressure of H2, volume of H2 and
temperature in the experiment?
 What are the values of STP?
7. What is the volume of one mole of this gas at
STP?
▪ Based on what we have calculated already, how can we
determine this?
Note: The data table on the back of the lab is a place to fill in your numbers
from the front of the lab.