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Chapter 19

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 cm 3 flask hold at 35.0  C and a pressure of 95.4 kPa?. 0.0466 mol.

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Chapter 19

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  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 35.0C and a pressure of 95.4 kPa? 0.0466 mol

  5. What pressure in kPa is exerted by 0.00306mol 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, 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?

  7. 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

  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 gramsand the moles. • GFM = grams/moles

  9. 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

  10. Remember our first question today.

  11. 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 = 0.0466 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 = 0.186 g/0.0466 moles = 3.99 g/mol ≈ 4 g/mol Therefore the gas is most likely He.

  12. 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

  13. Homework • Worksheet: The Ideal Gas Equation

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