ThermodynamicsI - THERMODYNAMICS I QUESTION 1 a) State the...

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THERMODYNAMICS I QUESTION 1 a) State the first law of thermodynamics, and explain what is meant by the term state function. b) Explain clearly the distinction between a bond dissociation enthalpy and a mean bond dissociation enthalpy. c) The following enthalpies of combustion have been measured at 298 K. W(s) + 1.5 O 2 (g) WO 3 (s) c H = -842.9 kJ mol -1 W(CO) 6 (s) + 4.5 O 2 (g) WO 3 (s) + 6CO 2 (g) c H = -2242.7 kJ mol -1 CO(g) + 0.5 O 2 (g) CO 2 (g) c H = -282.8 kJ mol -1 C(s) + O 2 (g) CO 2 (g) c H = -393.5 kJ mol -1 i) Calculate the enthalpy of formation of W(CO) 6 (s). ii) At 298 K, the enthalpies of sublimation of W(CO) 6 (s) and of W(s) are 75.6 and 849.4 kJ mol -1 respectively. Calculate the mean (W-CO) bond dissociation enthalpy in W(CO) 6 . QUESTION 2 a) From the expression dG = Vdp – SdT, derive equations for the variation of the vapour pressure of solid and liquid phases with temperature. b)
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This note was uploaded on 05/09/2010 for the course CHE 3051 taught by Professor Sitimachmud during the Spring '08 term at National Central University.

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ThermodynamicsI - THERMODYNAMICS I QUESTION 1 a) State the...

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