Gas Stoichiometry!
• Unless you are at STP you MUST convert between
Liters  moles using the Ideal Gas Law PV = nRT
• The only other exception is this: If (and only IF) the
compounds given to you in the problem on both sides
of the equation are measured in liters, you can use
the mole ratio conversion directly between them
• Problem: Using the equation:
2 H2 + O2  2 H2O
How many liters of water can be made from 25
liters of oxygen?
Helpful Concept Map:
• This map might be helpful to you in solving problems,
especially if you are a sequential problem solver:
Let’s Do Some Practice
• Problem: Given the equation:
2 H2 + O2  2 H2O
Using electrochemistry, we can make liquid water
from H2 and O2 gas. If I use 20.0 L of oxygen gas
at a pressure of 1.0 atm and a temperature of 350 C, how many grams of water will I make?
More Practice of
Stoichiometry!
• Use the following reaction to answer the next couple of
questions:
2 C8H18(l) + 25 O2(g) ----> 16 CO2(g) + 18 H2O(g)
• The above reaction is the reaction between gasoline
(octane) & oxygen that occurs inside car engines.
• If 4.00 moles of gasoline are burned, what volume of
oxygen is needed if the pressure is 0.953 atm, and the
temperature is 35.0°C?
• If you burned one gallon of gas (C8H18) (approximately
4000 grams), how many liters of CO2 would be produced
at a temperature of 21.0°C and a pressure of 1.00 atm?
Making of an Air Bag Lab
You are going to be utilizing the Ideal Gas
Law and Gas Law Stoichiometry to complete
today’s lab!
Please begin reading over the lab sheet to
see what you will be doing today.
End of:
Gas Law Stoichiometry
HW for Next Class: Complete combined Ideal Gas Law Practice and Gas
Law Stoichiometry Worksheet (Problems 6-9 turned in next class)
AND
Read pgs. 432-436 and take 5-10 bullet notes
AND
Complete Making Air Bag Lab activity if not finished already
AND
Complete any missing HW to use for upcoming HW Check next class