Answer:
In terms of thermodynamics, the
thermit reduction may be written as:
\[2/3C{{r}_{2}}{{O}_{3}}(s)+4/3\,Al(s)\xrightarrow{\,}\,4/3\,Cr(s)+2/3\]\[A{{l}_{2}}{{O}_{3}}(s);\,\,\Delta
{{G}^{o}}\,=-287\,\,kJ\]
The reduction is feasible as
such. However, a careful look reveals that all the reactant and product species
are solids. Therefore, the reaction does not take place at room temperature.
Upon heating, chromium melts which means that \[\Delta S\]will tend to increase
thereby making the reaction feasible.
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