Part XII 77. The volume of a sample of ais in a cylinder wiah a movable piston i

Question

Part XII 77. The volume of a sample of ais in a cylinder wiah a movable piston is 20L at a temperature T, as shown in the diagram above. The volume increases to 5.0L the gas is heated to T, while holding the pressure constant. What effect do the volume and temper changes have on the average kinetic energy of the molecules in the sample? 1 a) The average kinetic energy increases bj the average kinetic energy decreases c) the average kinetic energy stays the same d) t cannot be determined how the kinetic energy affected without knowing T, and 1 79. The volume of a sample of air in a cylinder with a movable piston is 5.0L at a temperature T, as shown in the diagram above. The volume decreases to 2.0L the gas is cooled to T, while holding the pressure constant. What is the ratio T/T a) 0.40 b)25) 10 d) It cannot be determined without knowing the initial pressure 83. The volume of a sample of air in a cylinder with a movable piston is 5.01at a pressure P, as shown in the diagram above The volume decreases to 2 0 L as the temperature is held constant The ai is now at P, What is the ratio P/ A)0 40 25 10 cannot be determined without knowing the initia temperature

Explanation / Answer

77. Answer is B) The average kinetic energy decreases .

Explanation: we know that avg K.E. = 3/2KT, and from ideal gas law if volume increases temperature decreases. So avg K.E. decreases.

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