1.2.7 chem.docx - 1 A spaceship is found to have a tiny...

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1. A spaceship is found to have a tiny leak that allows the effusion of air into space. Air in the spaceship is a mixture of nitrogen (N 2 ), oxygen (O 2 ), argon (Ar), and trace amounts of other gases. a. Predict which of the three main gases will have the lowest rate of effusion and which will have the highest rate. Explain your answer. (1 point) Since Ar has the highest molar mass it has the lowest rate of effusion and because N2 has the lowest molar mass, it will have the highest rate of effusion. b. Predict how the percentages of the gases in the air will change over time. (1 point) The percentages will change over time to mostly argon, a relative amount of oxygen and little to no nitrogen because it will expend the fastest. c. Argon is found to effuse through the hole at a rate of 1.6 × 10 –3 mol in 215 s. How much O 2 would effuse through the hole in the same amount of time? (2 points) There will be 1.80 × 10 –3 mol of O2 effused through the hole. d. Suppose the three gases were placed at 1.00 atm and 273 K in closed containers, as shown below. A tiny hole is opened in each container, allowing each gas to diffuse into another container filled with neon gas. What is the ratio of the rate of diffusion of nitrogen to the rate of diffusion of oxygen? Is this greater than, less than, or the same as the ratio of the rates of effusion for the two gases? (2 points) Nitrogen diffuses at a rate of 1.07 times faster than oxygen. The ratio of the rate of both effusion and diffusion are the same.

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