I need number 1 and 2 completed. Thanks in advance. A cylinder with a value at t

Question

I need number 1 and 2 completed. Thanks in advance.

A cylinder with a value at the bottom is filled with an ideal gas. The value is then closed. After which the piston is observed to be at a lower position. Assume that the system is in thermal equilibrium with the surroundings at all times. Is the final pressure of the gas in the cylinder greater then, less then or equal to the initial pressure? explain. Explain how your answer is consistent with the forces acting on the piston in the initial and final states. In this process, which of the quantities P.V. n, and T are held constant and which are allowed to change? Consider the following incorrect student statement what is the flaw in the student's reasoning? Explain why it is not possible to use the ideal gas law to determine whether the pressure changed in this process. A long pain is used to bold the piston in place as shown in the diagram. The cylinder is then placed into bolding water. Does the temperature of the gas increase .decrease.or remain the same? Sketch this process in the PV diagram at right. Explain why for this particular situation, it is not possible to determine the pressure of the gas as you did on page 1 of the tutorial (i,e., by considering a free-body diagram of the piston).

Explanation / Answer

1)

a)

As temperature remains costant and no heat is exchanged,

P inversely proportional to V, PV = nRT = const.

so,

Pressure increases. greater than initial pressure, as V decreases.

as

There are three forces acting on piston, force due to gravity (downward) , force due to atmospheric pressure (downward) and force applied by gas molecules (upward).

orce due to gravity , force due to atmospheric pressure will remain unchanged in initial and final position. but force applied by gas molecules will decreases as no. of gas molecules is decreased. so, downward pressure will be more, so pressure is increased.

(hey I;ve assumed that it's ideal gas) ...

b)

T will remain constant.

c)

At Constant Temperature , P is inversely Proportional to V ... student hasn't mesioned this fact about temp.

d)

In ideal gas, we consider that pressure exrted by molecules on wall is independent of the no. of molecules in container. but that's not the case here

2)

a)

Temperature will decrease.

b)

P will decrease, and V will remain Constant.

c)

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