for
the formation of Cr2O3 is ?540 kJ mol?1 and
that of Al2O3 is ?827 kJ mol?1 Is the
reduction The value of Cr2O3 possible with Al ?
Answer:
The two thermochemical
equations may written as follows :
2/3Cr(s) + O2(g)
?.(i)
2/3AI(s) + O2(g)
Al2O3(s)
;
?.(ii)
Eqn. (ii) ? (i)
gives
Cr2O3(s)
+ 2/3AI(s) Al2O3(s)
+ 2/3Cr(s);
Since 
comes
out to be negative, the react is feasible.
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