1. Ch. 14
Gases

2. Arrange the following in order of increasing velocity at 125°C: 1)CO2 2)N2 3)Kr 4)H2O
Combined Gas Law
P1V1 = P2V2
T T2
Use when you have a BEFORE and an AFTER situation
What volume would 1.80 L of oxygen gas at a temperature of 20°C and 112kPa occupy at STP?

3. Avogadro’s Principle
Equal volumes at the same conditions have equal number of _________.
A container is filled with 2.6g sulfur trioxide gas. It is emptied and filled with 6.0g of an unknown gas at the same conditions. Calculate the molar mass of the unknown gas.

4. Gas Stoichiometry (mol house)
If 1.39 g of carbon monoxide is reacted with oxygen, what volume of carbon dioxide is produced at 12.3°C at 107.4KPa?
Ideal Gas Law PV=nRT
Use when NOT at STP.
A 2.00L flask is filled with propane gas (C3H8) at 1.00atm and -15.0°C. What is the mass of the propane in the flask?

5. Gas Density
D=MP RT
Calculate the density of krypton gas at 33°C and a pressure of 755torr.

6. Know the Standard Pressures
______ mmHg
______ torr
______ atm
______ kPa
Know the Standard Temperatures
______ °C
______ K
Know Absolute Zero
LAB CALCULATIONS!