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| 1. |
Thereaction,Cr_2 O _3 + 2 Al toAl_2O _ 3+2Cr (Delta G ^(@)= -421 kJ )isthethermodynamicallyfeasibleasisapparent from theGibbs energyvalue. Why doesit not take placeat roomtemperature ? |
| Answer» Solution :The interpretationof`Delta G^(@)`isbaseduponon K` (DeltaG^(@) =- RT `LN K ),theequilibriumconstant. Sincein the givenredoxreaction, all THEREACTANTS andtheproductsare solidsat roomtemperature, therefore, theredoesnot existanyequilibriumbetweenthereactantsandthe productsand hencethereactiondoes notoccur at roomtemperature. HOWEVER, athightemperature,whenchromiummelts, thevalueof` T DeltaS `increases. AAA result ,thevalueof` Delta _rG^(@)`becomes more-veandhencethereactionproceeds rapidly. | |