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The value of `triangle_(f)G^(ɵ)(Cr_2O_3)=-540kJmol^-1` and `triangle_(f)G^(ɵ)(Al_2O_3)=-827kJmol^-1`. Is reduction of `Cr_2O_3` possible with Al? |
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Answer» (a). `2Cr+(3)/(2)O_2toCr_2O_3` `triangle_(f)G_a^(ɵ)=-540kJmol^-1` (b). `2Al+(3)/(2)O_2toAl_2O_3` `triangle_(f)G_(b)^(ɵ)=-827kJmol^-1` Required: c. `Cr_2O_3+2AltoAl_2O_3+2Cr` `triangle_fG_c^(ɵ)=?` As `(c)=(b)-(a)` `triangle_fG_c^(ɵ)=triangle_fG_f^(ɵ)-triangle_fG_a^(ɵ)` `=(-827+540)kJmol^-1` `=-287kJmol^-1` Since `triangle_fG_c^(ɵ)` is negative, hence Al can reduce `Cr_2O_3`. |
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