1. Chapter 19
The Ideal Gas Equation

2. The Ideal Gas Equation PV = nRT P = pressure V = volume
n = number of moles
T = temperature
R = gas constant

3. R values a A I

4. How many moles of gas will a 1250 cm3 flask hold at 35
How many moles of gas will a 1250 cm3 flask hold at 35.0C and a pressure of 95.4 kPa?
mol

5. What pressure in kPa is exerted by 0. 00306mol of gas in a 25
What pressure in kPa is exerted by mol of gas in a 25.9cm3 container at 9.0°C?
277 kPa

6. The Concorde, a supersonic passenger jet flew its last flight on November 26, It was a major pollution concern in that it produced 6.6 x 104 kg of CO2 for each hour of flight at 42 kPa and 627°C. How many liters of CO2 is this?

7. The Concorde, a supersonic passenger jet flew its last flight on November 26, It was a major pollution concern in that it produced 6.6 x 104 kg of CO2 for each hour of flight at 42 kPa and 627°C. How many liters of CO2 is this?
2.67 x 108 L = 267,000,000 L

8. Gram Formula Mass (Molar Mass)
The ratio of grams per mole.
H2 = 2 g/mol
CO2 = 44 g/mol
H2O = 18 g/mol
We can therefore calculate gram formula mass if we know the grams and the moles.
GFM = grams/moles

9. A poisonous gas is leaking out of an old gold mine
A poisonous gas is leaking out of an old gold mine. A chemist collects grams of the gas and uses the ideal gas equation to determine that this is moles. Is the gas CH4, CO, or AsH3
MM = 28 g/mol

10. Remember our first question today.

11. How many moles of gas will a 1250 cm3 flask hold at 35
How many moles of gas will a 1250 cm3 flask hold at 35.0C and a pressure of 95.4 kPa?
n = PV / RT = mol
0.186 g of a gas at 35.0C and 95.4 kPa occupies a volume of 1250 cm3. Is the gas H2, He, O2, or CO2?
GFM = grams/mole
= g/ moles
= 3.99 g/mol ≈ 4 g/mol
Therefore the gas is most likely He.

12. (a) BH3 (b) B4H10 (c) B2H6 (d) B3H12 (e) B5H14
1.00g of a gas occupies dm3 at 760 torr and 3.0°C. The gas is most likely:
(a) BH3 (b) B4H (c) B2H6 (d) B3H (e) B5H14

13. Homework
Worksheet: The Ideal Gas Equation