SCIN 131 Tests and Quizzes 6

Question 1 of 25 4.0 Points `Suppose you have a fixed container containing 2.48 moles of gas. If the container volume is 30.0 L, and the pressure is 2.05 atm, what is the temperature (°C)? (R= 0.0821 L ∙ atm / mol ∙ K) A.302 B.-84 C.189 D.29 Answer Key: D Feedback: Ideal gas law is discussed in 11.8 Question 2 of 25 4.0 Points `I have a pressure cooker in my underground lair that is brewing a diabolical solution. I set everything up and went upstairs, but forgot to write down the initial temperature. When I came downstairs later to check on it, I see that the pressure gauge shows that the pressure has decreased by 10 times, while the volume increased by 5 times. The temperature now reads -123.15 °C. What was the starting temperature when I left (in °C)? A.-198 B.75 C.27 D.300 Answer Key: C Feedback: Good. Combined gas law is discussed in 11.6 Question 3 of 25 4.0 Points `Which sentence below is NOT true about pressure? A. After creating a pressure difference, the atmospheric pressure can push liquid up a straw. B. The atmosphere has a pressure as the components of air collide with surfaces. C.A deep well dug in the ground must have the pump located at the bottom of well in order to have the water come to the surface. D.Pressure is caused by gas molecules colliding with surfaces. E.All of the above statements are true. Answer Key: E Feedback: Good. pressure is discussed in 11.3 Question 4 of 25 4.0 Points `I have a cylinder sitting in my lab that contains 0.500 L of 25.85 C gas, and it's pressure is 14.7 psi. If I push the cylinder and increase the pressure to 22.6 psi and the temperature to 59.85 C, what will be the new volume of the gas in L? A.2.77 L B.0.691 L C.0.362 L D.1.45 L Answer Key: C Feedback: Good. Combined gas law is discussed in 11.6 Question 5 of 25 4.0 Points `I am blowing up balloons for my daughter's birthday party. I want them to float while tethered to a table, but I only have a little bit of helium left in the tank. So I can only use a little in each balloon, and I will fill the rest of the balloon with oxygen and nitrogen (I thought it would be much more entertaining to have elemental oxygen in the balloons around all those birthday candles!). Suppose that in each balloon, the oxygen has a pressure of 0.292 atm and the nitrogen has a pressure of 0.587 atm. If the total pressure inside the cylinder is 1.01 atm, what is the pressure that is due to the helium? A.0.131 atm B.1.01 atm