2. Daltons Law P t = P 1 + P 2 + P 3 +…….

3. Daltons Law P t = P 1 + P 2 + P 3 +……. P t = x 1 p t + x 2 p t + x 3 p t +……. x = mole fraction p = total pressure

4. Practice – page 177 A sample of natural gas contains 8.24 moles of methane (CH 4 ) 0.421 moles of ethane (C 2 H 6 ) and 0.116 mole of propane (C 3 H 8 ). If the total pressure of the gases is 1.37 atm, what are the partial pressures of the gases

5. Pressure of water vapor

6. Problem page 179 Hydrogen gas generated when calcium metal reacts with water is collected. The volume of gas collected at 30 C and pressure of 988 mm Hg is 641 mL. What is the mass in grams of the hydrogen gas obtained. The pressure of water vapor at 30 C is 31.82 mm Hg.

7. Speed of Gases

8. Root Mean Square Speed of Gases R = 8.314 J *K / mol J = 1kg * m 2 / s 2 MM = molar mass

9. Problem page 186 Calculate the root mean square speed of molecular chlorine in m/s at 20 C.

10. Determining Molecular Speed