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In this lesson, we will learn how to relate the net work done on, the heating of, and the change in internal energy of a gas with varying pressure and/or volume.
Q1:
It is found that, when a dilute gas expands quasi-statically from a volume of 0 . 5 3 L to a volume of 6.20 L, the gas does 480 J of work. Assuming that the gas temperature remains constant at 330 K, how many moles of the gas’s molecules are contained in the gas?
Q2:
An ideal gas expands quasi-statically and isothermally from a state with pressure 2.2 bar and volume 0.85 L to a state with volume 1.70 L. How much heat is added to the expanding gas?
Q3:
Two moles of helium gas are placed in a cylindrical container with a movable lid held in place by a piston. The gas is at a temperature of 2 5 ∘ C and at a pressure of 3 . 0 × 1 0 5 Pa. The pressure supplied by the piston is decreased but the temperature of the gas does not change. The volume of the gas doubles.
Find the work done by the piston on the gas during the expansion.
How much heat enters the gas? Assume ideal gas behavior.
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