## q and w

$w=-P\Delta V$
and
$w=-\int_{V_{1}}^{V_{2}}PdV=-nRTln\frac{V_{2}}{V_{1}}$

Carlos Gonzales 1H
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### q and w

Example 8.5 in the textbook shows that for the reversible and irreversible pathways q and w have the same values, but the signs are different. Does this apply for all problem where only the sign is different in q and w?

Joshua Hughes 1L
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### Re: q and w

Δ U= q + w
In this example it said Δ U = 0, meaning there was no change of internal energy of the system.
So long as Δ U is 0 with no change to the internal energy, q and w should be the same but with opposite signs I think. q=w- if Δ U=0

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