The value of `Delta_fG^(Theta)` for formation of `Cr_2 O_3` is – 540 kJ `"mol"^(-1)`and that of `Al_2 O_3` is – 827 kJ `"mol"^(-1)` . Is the reduction of `Cr_2 O_3` possible with Al ?

The Value of DeltaG^(@) for the formation of Cr_(2)O_(3) is -"540KJ mol"^(-1) and that of Al_(2)O_(3) is -827"KJ mol"^(-1) . Is the reduction of Cr_(2)O_(3) possible with Al ?

The Nature of Al_2 O_3 is

Carbon cannot be used in the reduction of Al_2 O_3 because

The standard enthalpy of formation of hypothetical MgCl is -125kJ mol^(-1) and for MgCl_(2) is -642 kJ mol^(-1) . What is the enthalpy of the disproportionation of MgCl ?

If the standard molar enthalpy of formation of SO _(2 (g)) and SO _(3(g)) is - 296 . 82 kJ mol ^(-1) and -395 . 72 kJ mol ^(-1) respectively, then enthalpy change for the reaction in kJ mol ^(-1) , SO _(2 (g)) + (1)/(2) O _(2 (g)) to SO _(3(g)) , is

If the standard molar enthalpy of formation of CaO_((s)), CO_(2(s)) and CaCO_(3(s)) is -635, -393 and -1207kJ "mol"^(-1) respectively, the Delta_r H^(o.) in kJ mol^(-1) for the reaction CaCO_(3(s)) rarr CaO_((s)) + CO_(2(g)) is