A) Which of the following is/are true if no energy is added as heat during the e

Question

A) Which of the following is/are true if no energy is added as heat during the expansion of an ideal gas? (Select all that apply.)
The expanding gas does work on the walls of its container.
The temperature of the gas need not change.
The temperature of the gas must change because of changes in internal energy.
The pressure need not change.
The pressure cannot remain constant.

B) Gas in a cylinder similar to the one shown in the figure moves a piston with area 0.226 m2 as energy is slowly added to the system. If 2.74 103 J of work is done on the environment and the pressure of the gas in the cylinder remains constant at 1.01 105 Pa, find the displacement of the piston.
?y = m

Explanation / Answer

1.The expanding gas does work on the walls of its container.
2.The temperature of the gas must change because of changes in internal energy.
3.The pressure cannot remain constant.

force x displacement = work done
pressure x displacement / area = W
W = P x d/A
2.703 x 103 = 1.01 x 105 x d/0.226

d = 0.6048 x 10-2 m

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