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CHEM 254 (1)

CHEM 254 Textbook Notes.docx

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CHEM 254
William Power

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- The reversible work is the lower bound for the compression work and the upper bound for the expansion work - The maximum work that can be extracted from a process between the same initial and final states is that obtained under reversible conditions - What does the first law look like under reversible and constant pressure conditions? o We write: look on page 30 for eq’n o H = U + PV - Because chemical reactions are much more frequently carried out at constant P than constant V, the energy change measured experimentally by monitoring the heat flow is deltaH rather than deltaU - Because U is a state function, deltaU is independent of the path between the initial and final states - If one knows Cv, T1, and T2, deltaU can be calculated, regardless of the path between the initial and final states - Eq’n 2.34 - Because deltaH is a function of T only for an ideal gas, this eq’n holds for all processes involving ideal gases, whether P is constant or not as long as it is reasonable to assume that Cp is constant - If the initial and final temperatures are known or can be calculated, and if Cv and Cp are known, deltaU and deltaH can be calculated regardless of
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