Answer to Question #131197 in Inorganic Chemistry for Avii

Question

The value of ∆G\deg for formation of Cr_(2)O_(3) is -540 kJmol^(-1) and that of Al_(2)O_(3) is -827 kJmol^(-1). Is the reduction of Cr_(2)O3 possible with Al ?

Answer 1

Yes, the reduction of Cr_(2)_O_(3) with Al is possible. ∆G ( of this reaction) <0. ∆G=-827-(-540)= -827+540=-287