Advanced Geochemistry of Natural Waters
Advanced Geochemistry of Natural Waters GEOL 578
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This 2 page Class Notes was uploaded by June Gottlieb on Friday October 23, 2015. The Class Notes belongs to GEOL 578 at University of Idaho taught by Scott Wood in Fall. Since its upload, it has received 28 views. For similar materials see /class/227864/geol-578-university-of-idaho in Geology at University of Idaho.
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Date Created: 10/23/15
LOW TEMPERATURE AQUEOUS GEOCHEMISTRY GEOL 478578 THERMODYNAMICS PROBLEM SET LESSON 1 PROBLEM ONE The weathering of pyrite in coal mines and in metal sul de ore deposits can be represented by the following reaction 2FeSzs 702g 2H201 2Fe2aq 4SO4239aq 4Haq Given the following enthalpies should miners be prepared to ght res or to wear very warm clothing Species or phase AHf0kJmole FeSzs 17154 H200 28583 Fe2aq 891 SO4239aq 90927 Haq 0 PROBLEM TWO Given that ASrO l6669 JmoleK for the reaction shown in 1 above nd the Gibbs free energy of the reaction under standard state conditions 25 C 1 bar Will this reaction proceed spontaneously or not PROBLEM THREE Using the thermodynamic data below determine which of the two mineral pairs pyrolusite magnetite or manganite hematite are stable at 298 K and 1 bar 2MnOzpyrolusite 2Fe304magnetite Mn203manganite 3Fe203hematite Species or phase AHf0kJmole AGf0ldmole MnOz 52003 46514 Mn203 95897 88107 Fe304 111573 101257 Fe203 82464 74268 PROBLEM FOUR Using the data supplied below calculate the standard enthalpy changes and freeenergy changes for the following reactions at 25 C Sns 02g SnOzs KCls Kaq Cl39aq 2FeCO3s 1 202g 2H201 Fe203s 2H2CO3aq Which of the three reactions is most endothermic Which is more stable at room temperature in contact with air a tin or cassiterite b hematite or siderite Species or phase AHf0kJmole AGfOGdmole H2C03aq 69965 623 17 Cl39aq 16708 13127 FeC03s 73699 66670 Fe203 82464 74268 Kl 252 17 28249 KCls 43647 40855 HzO1 28583 237 14 SnOzs 58074 51990 PROBLEM FIVE Using the data below calculate the equilibrium constant of the following reaction at 25 and 100 C PbSgalena Pb S Species or phase AHf0kcalmole AGfOC 39 39 PbSgalena 240 236 239 79 205 Pb 04 58
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