1. The Ideal Gas Law

2. The ideal gas law Relates pressure, temperature,volume, and the number of moles of a gas

3. PV = nRT P = pressure in atm V = volume in L n = number of moles R = 0.08206 L atm K mol K mol T = temperature in Kelvin

4. How the value of R is determined R = PV nT nT At STP, P = 1atm V = 22.4 L V = 22.4 L T = 273 K T = 273 K R = (1 atm)(22.4L) = 0.0821 (1 mol)(273K) (1 mol)(273K)

5. An Ideal Gas The relationship between volume, pressure, and temperature assumes that the gas behaves ideally. - Gas particles have no attraction for each other. - Gas particles have no attraction for each other. - Gas particles have no volume. - Gas particles have no volume.

6. An underground cavern contains 2.24 x 10 6 L of methane gas at a pressure of 15.0 atm and a temperature of 42 0 C. What mass of this natural gas does the cavern contain?

7. Modification of the ideal gas law R = P 1 V 1 before change n 1 T 1 n 1 T 1 R = P 2 V 2 after change n 2 T 2 n 2 T 2 P 1 V 1 = P 2 V 2 n 1 T 1 n 2 T 2 n 1 = n 2 thus, P 1 V 1 = P 2 V 2 n 1 = n 2 thus, P 1 V 1 = P 2 V 2 T 1 T 2 T 1 T 2