Lo 3 The student is able to select and apply mathematical relationships to mass data in order to justify a claim regarding the identify and/or estimated purity of a substance. (Sec 5, 7) lo 3

27.4 L of oxygen gas at 25.0°C and 1.30 atm, and 8.50 L of helium gas at 25.0°C and 2.00 atm were pumped into a tank with a volume of 5.81 L at 25°C.

• 27.4 L of oxygen gas at 25.0°C and 1.30 atm, and 8.50 L of helium gas at 25.0°C and 2.00 atm were pumped into a tank with a volume of 5.81 L at 25°C.
• Calculate the new partial pressure of oxygen.
• 6.13 atm
• Calculate the new partial pressure of helium.
• 2.93 atm
• Calculate the new total pressure of both gases.
• 9.06 atm

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• EXERCISE!

AP Learning Objectives, Margin Notes and References

• Learning Objectives
• LO 2.4 The student is able to use KMT and concepts of intermolecular forces to make predictions about the macroscopic properties of gases, including both ideal and nonideal behavior.
• LO 5.2: The student is able to relate temperature to the motions of particles, either via particulate representations, such as drawings of particles with arrows indicating velocities, and/or via representations of average kinetic energy and distribution of kinetic energies of the particles, such as plots of the Maxwell-Boltzmann distribution.
• Additional AP References
• LO 5.2 (see Appendix 7.2, “Thermal Equilibrium, the Kinetic Molecular Theory, and the Process of Heat”)