AP Chemistry  Avogadro's Law of Combining Volumes 
STP:
22.4 L at 0^{o}C and 1 atmosphere pressure (101.325 kPa) 
SATP:
24.8 L at 20^{o}C and 100 kPa pressure 
1. 
A sample of carbon dioxide gas has a volume of 55.0 mL at 45^{o}C
and 85.0 kPa. Determine the volume at STP and SATP.

2. 
What pressure will 37.18 grams of CO_{2} gas exert on
a container at standard temperature?

3. 
Find the mass of 543 mL of acetylene gas, C_{2}H_{2},
collected at a pressure of 85.0 kPa and standard temperature.

4. 
What is the density of CO_{2} gas measured at 5^{o}C
and 200 kPa?

5. 
A sample of cooking gas, taken from a cylinder, was collected
and its density measured at 27^{o}C and 100 kPa. The density at
those conditions was 1.768 g/L. What was the molar mass of the cooking gas?

6. 
At STP, how many molecules of hydrogen are in 22.4 L?

7. 
Given 4.80 g of O_{2} gas and 2.80 g of N_{2}
gas. Calculate for each of these samples: 

(a) the number of moles 

(b) the number of molecules 

(c) the number of atoms 

(d) the volume of each at STP and SATP 