2012 Study-Guide-2

Melting vaporization and sublimation are endothermic

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Unformatted text preview: U = CV (TB - TA) = n CVm (TB - TA) ΔH = CP (TB - TA) = n CPm (TB - TA) q = ΔH w = ΔU - q = ΔU - ΔH = - nR (TB - TA) = - pB (VB - VA) = - pext (VB - VA) Isothermal Compression / Expansion: TA = TB (Only p and V vary) pA VA = pB VB ΔU = CV (TB - TA) = 0 ΔH = CP (TB - TA) = 0 q = - w w = - pext (VB - VA) for expansion/compression at constant external pressure w = - nRTA ln (VB / VA) for reversible expansion/compression (p = pext = variable) Adiabatic Compression / Expansion: q = 0 (P, V and T vary during process) ΔU = CV (TB - TA) = n CVm (TB - TA) ΔH = CP (TB - TA) = n CPm (TB - TA) To calculate the work: Use w = - Pext (VB - VA) or w = ΔU for an adiabatic process under constant Pext Use w = Δ...
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This note was uploaded on 01/26/2014 for the course CHEM 3615 taught by Professor Aresker during the Spring '07 term at Virginia Tech.

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