Question

Physics_2_2.5

An ideal monatomic gas is in a vessel with the volume V1 = 1m3 under the pressure p1 = 2 105 Pa. The gas is first heated at a constant pressure to the Volume V2 = 3m3 and then at constant volume to the pressure p2 = 5 105 Pa. Find the amount of heat Q supplied to the gas.

A clear process is highly appreciated! Thank you so much for the help!

Answer #1

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A student wrote:
If I expand an ideal gas from V1 to V2 under constant external
pressure and pex, then the work done
is w = -pex(V2 - V1). As a result, if the expansion
is isothermal, then as delta U = q + w = 0, then
q = -w = pex(V2 - V1). Therefore, delta S
=qrev/T=(p/T)(V2 - V1).
Is this statement correct or incorrect? Explain your answer.

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_____J
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