1. Do NOW
Please draw the Lewis Dot structure of NO3-1 and identify if it is a polar or nonpolar molecule.

2. Ideal Gas Law

3. STP
Standard Temperature and Pressure
T = 273 K (0 °C)
P = 1 atm

4. Ideal Gas Law
PV = nRT
R = ideal gas constant

5. Ideal Gas Constant
R = (L atm)/(mol K) R= (L kPa)/(mol K) R = 62.4 (L mmHg)/(mol K)

6. Example
Calculate the number of moles of gas contained in a 3.0 L vessel at 3.00 x 102 K with a pressure of 1.50 atm.
0.18 mol

7. Example
What volume will an ideally behaving gas containing 1.00 mole of particles occupy at STP?

8. If I have 17 moles of gas at a temperature of 340 K, and a volume of liters, what is the pressure of the gas?

9. If I have 1.9 moles of gas held at a pressure of 5 atm and in a container with a volume of 50 liters, what is the temperature of the gas?

11. Gas Stoichiometry 2C4H10(g) + 13O2(g)  8CO2(g) + 10H2O(g)
What type of reaction is this?
How many moles of butane gas react with how many moles of oxygen gas?

12. 2C4H10(g) + 13O2(g)  8CO2(g) + 10H2O(g)
Gas Stoichiometry
2C4H10(g) + 13O2(g)  8CO2(g) + 10H2O(g)
Avogadro’s Principle: = V of gas at same T & P contain = # of particles
 Coefficients represent not only molar amounts, but also relative volumes

13. Gas Stoichiometry- Volume Only
CH4(g) + 2O2(g)  CO2(g) + 2H2O (g) It takes 2 L of O2 to react completely with 1 L of CH4 The complete combustion of 1 L of methane produces 1 L of carbon dioxide and 2 L of water vapor. What volume of methane is needed to produced 26 L of water vapor?

14. Gas Stoichiometry- Volume Only
What volume of oxygen gas is needed for the complete combustion of 4 L of propane gas? Assume constant pressure and temperature.
C3H8(g) + 5O2(g)  3CO2(g) + 4H2O(g)
20.0 L O2

15. Gas Stoichiometry- Volume & Mass
Balanced chemical equations allow you to find ratios for moles and volume – not for masses!

16. Gas Stoichiometry- Volume & Mass
N2(g) + 3H2(g)  2NH3(g) If 5.00 L of nitrogen reacts completely by this reaction at a constant pressure and temperature of 3.00 atm and 298 K, how many grams of ammonia are produced?
Givens:
VN2 = 5.00 L
P = 3.00 atm T = 298 K
Unknown: mNH3 = ?

17. N2(g) + 3H2(g)  2NH3(g) Find VNH3.
Rearrange Ideal Gas Law equation to solve for n.
Convert moles of ammonia to grams.

18. N2(g) +3H2 (g)→ 2NH3(g)
What volume of nitrogen at STP would be required to react with mol of hydrogen to produce ammonia?

19. 4Fe(s) + 3O2(g)  2Fe2O3(s)
Calculate the volume of oxygen gas at STP that is required to completely react with 52.0 g of iron.
Convert Fe mass to moles.
Determine number of moles of O2.
Determine volume of O2 using Ideal Gas Law.
Givens:
mFe = 52.0 g
T = 273 K
P = 1 atm
15.6 L
Unknown:
VO2 = ?