LAB 32 - syikin - Experiment 32 Thermodynamics of...

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Experiment 32 : Thermodynamics of Electrochemical Cells Abstract The electromotive force of a cell was measured at different temperature to obtain P T E . P T E was found out to be K Volts 4 10 ) 5 . 0 4 . 1 ( - × ± - . From that number, other thermodynamics properties at 25°C were calculated. ∆G was calculated to be -308270 ± 150 mol Joule . ∆S was found out to be -26.8 ± 10.3 Kelvin mol Joule . ∆H was 316000 ± 3000 mol Joule . From the above numbers, irreversible heat and reversible heat was calculated to be -316000 ± 3000 mol Joule and -8000 ± 3000 mol Joule respectively. Introduction The objective of this experiment is to determine ∆G, ∆H and ∆S in a cell reaction. A reaction needs to be carried out reversibly in a cell and the measurement of reversible cell potential with respect to temperature needs to be done in order to determine ∆G, ∆H and ∆S. In this experiment, the following reaction was carried out in a cell: Zn(s) + Ag 2 O(s) ZnO(s) + 2 Ag(s) The cell potential was determined at different temperature (25 o C, 35 o C and 45 o C) to get P T E . The voltmeter needs to be calibrated for offset error and gain error. The corrected values was then used to get the thermodynamic properties.
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Data and Calculations
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