Chapter 19 The Ideal Gas Equation
The Ideal Gas Equation PV = nRT P = pressure V = volume n = number of moles T = temperature R = gas constant
R values a A I
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 35.0C and a pressure of 95.4 kPa? 0.0466 mol
What pressure in kPa is exerted by 0. 00306mol of gas in a 25 What pressure in kPa is exerted by 0.00306mol of gas in a 25.9cm3 container at 9.0°C? 277 kPa
The Concorde, a supersonic passenger jet flew its last flight on November 26, 2003. 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?
The Concorde, a supersonic passenger jet flew its last flight on November 26, 2003. 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
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
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 4.564 grams of the gas and uses the ideal gas equation to determine that this is 0.163 moles. Is the gas CH4, CO, or AsH3 MM = 28 g/mol
Remember our first question today.
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 35.0C and a pressure of 95.4 kPa? n = PV / RT = 0.0466 mol 0.186 g of a gas at 35.0C and 95.4 kPa occupies a volume of 1250 cm3. Is the gas H2, He, O2, or CO2? GFM = grams/mole = 0.186 g/0.0466 moles = 3.99 g/mol ≈ 4 g/mol Therefore the gas is most likely He.
(a) BH3 (b) B4H10 (c) B2H6 (d) B3H12 (e) B5H14 1.00g of a gas occupies 0.820 dm3 at 760 torr and 3.0°C. The gas is most likely: (a) BH3 (b) B4H10 (c) B2H6 (d) B3H12 (e) B5H14
Homework Worksheet: The Ideal Gas Equation