The document provides information about the ideal gas law and how it can be used to calculate the moles of oxygen gas in a balloon given the pressure, volume, and temperature. It then discusses why supplemental oxygen is needed at high altitudes due to the low partial pressure of oxygen in the atmosphere. Finally, it explains Graham's law of effusion and diffusion, which states that lighter gases will effuse and diffuse faster than heavier gases at the same temperature due to their lower molar mass and higher kinetic energy.
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Lecture 14.4- Diffusion (HONORS)
1. Chemistry 14.4 Bellwork- Ideal Gas Law How many moles of oxygen gas are in a balloon at 25 C with an internal pressure of 1.1 atm and a volume of 1500ml? P 1 V 1 P 2 V 2 PV = nRT T 1 T 2 R= 8.31 L kPa / K mol R= 0.0821 L atm / K mol =
15. During effusion , a gas escapes into a vacuum through a tiny hole in its container.
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Three gases are combined in container T. The pressure that each gas exerts is independent of the pressure exerted by the other two gases. The pressure in container T is the sum of the pressures in containers A, B, and C. Interpreting Diagrams What is the relationship between the number of particles in containers A and C and the partial pressures of the gases in A and C?
This climber is using a tank of compressed gas to supplement the supply of oxygen available at high altitudes.
Firefighters carry tanks of compressed air. The tanks contain from 19.5% to 23.5% oxygen by volume.
The diffusion of one substance through another is a relatively slow process. a) Bromine vapor is diffusing upward through the air in a graduated cylinder. b) After several hours, bromine vapors are near the top of the cylinder. Predicting What will happen as the bromine continues to diffuse?
The diffusion of one substance through another is a relatively slow process. a) Bromine vapor is diffusing upward through the air in a graduated cylinder. b) After several hours, bromine vapors are near the top of the cylinder. Predicting What will happen as the bromine continues to diffuse?
The character balloons used in parades are filled with helium gas so that they will float.
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