Gases (Ch 5) 1. Describe Boyle’s Law, Charles’ Law and Avogadro’s Law. If you combine them, what do you get ? Gases (Ch 5) 2. A tank of nitrous oxide (N2O) has a volume of 160. L and contains 34.5 kg of the gas. At 25 °C, what is the pressure of the nitrous in the tank? Gases (Ch 5) 3. A balloon is filled with 1.00 L of helium at 27.0 °C and 1.00 atm. The balloon rises to a point in the atmosphere where the temperature is -35.0 °C and the pressure is 250. torr. What is the change in volume the balloon underwent? Gases (Ch 5) 4. Consider the flasks diagrammed below. What is the total pressure (in atm) after the stopcock between the two flasks is opened? (Assume the final volume is 3.00 L) Gases (Ch 5) 5. An unknown diatomic gas has a density of 3.164 g/L at STP. What is the identity of the gas? Gases (Ch 5) 6. A mixture of 1.00 g of hydrogen and 1.00 g of helium exerts a pressure of 0.480 atm. What is the partial pressure of each gas? Gases (Ch 5) 7. A gas mixture of Ne and Ar has a total pressure of 4.00 atm and contains 16.0 mol of gas. If the partial pressure of Ne is 2.75 atm, how many moles of Ar are in the mixture? Gases (Ch 5) 8. The hydrogen gas formed in a chemical reaction is collected over water at 30.0 °C at an atmospheric pressure of 732 torr. If the volume of gas collected is 722 mL, calculate the mass of hydrogen produced by the reaction. (The vapor pressure of water at 30.0 °C is 31.86 torr) Gases (Ch 5) 9. According to Kinetic Molecular Theory, what are the assumptions for an ideal gas? Gases (Ch 5) 10. Indicate if and how each of the following changes will affect these properties: Increasing the Increasing the Increasing volume mass of gas temperature particle Average kinetic energy Root mean square velocity Frequency of collisions Increasing moles of gas Gases (Ch 5) 11. It took 10.0 minutes for a sample of hydrogen gas to effuse through a porous barrier. How long will it take for the same amount of chlorine gas to effuse under identical conditions? Gases (Ch 5) 12. Answer the following, given the velocity curves below: a. If the plots represent 1.0 L H2 versus 1.0 L N2 at STP, which corresponds to each gas? b. If the plots represent 1.0 L H2 at 273 K versus 1.0 L H2 at 1000 K, which corresponds to each temperature? Gases (Ch 5) 13. Consider 784 mol of nitrous gas (N2O) in a 160 L tank at 25.0 °C . Calculate the pressure using: a. the ideal gas law b. the van der Waals equation (a= 3.83 atm L2/mol2, b = 0.044 L / mol) Gases (Ch 5) Bonus Q: What happens to a person who inhales SF6 gas (a gas more dense than air)? … ….see for yourself: https://www.youtube.com/watch?v=FvvSIAqOkIw