userdata-paziras-Chem101-Chap_05A

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Unformatted text preview: 6 Chemistry 101 Chapter 5 Examples: 0 1. 1 mo l of gas occupies 22.4 L at STP. What is the volume at 20.0 C and 749 mm Hg ? Initial Final V1 = 22.4 L 0 T1 = 0 C T1 = 273 K P1 = 760.0 mm Hg V2 = ? 0 t2 = 20.0 C T2 = 293 K P2 = 749 mm Hg V2 = V1 x Temperature Ratio x Pressure Ratio T- V- P¯ V- Vf 293 K 760.0 mmHg = 22.4 L x ¾¾¾ x ¾¾¾¾¾¾ = 24.4 L 273 K 749 mm Hg 2. A sample of oxygen gas wit h a mass of 46.0 g is contained in a 175 mL flexible container at a particular temperature and pressure. If 10.0 g of the gas leaks out, what is the vo lume of the container at the same temperature and pressure? 3. A propane (C3H8) tank is opened and 30.0 L of gas at STP is released. What is the mass of the gas released? 17 Chemistry 101 Chapter 5 The Ideal Gas Law · The 3 relationships that have been derived for gases can be co mbined into a single equat ion. 1. The Volume of a gas is inversely proportional to its Pressure 1 V = k ¾ P Boyle’s Law Constant 2. The Volume of a gas is directly proportional to its Absolute Temperature V = b T Charles’ Law Constant 3. The Volume of a gas is direct ly proportional to the number of mo les, n V = a n Avogadro’s Law Constant T n It follows: V µ ¾¾ P T n V = R ¾¾ P Molar Gas Constant (Proportionality Constant) 18 P V = n...
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