The enthalpies of formation of A12O3 and Cr3O3 are -1596 kJ and -1134 kJ respectively. Δ H for the reaction 2Al+Cr2O3arrow2Cr+Al2O3

Question

The enthalpies of formation of A12O3 and Cr3O3 are -1596 kJ and -1134 kJ respectively. Δ H for the reaction 2Al+Cr2O3arrow2Cr+Al2O3 (A) -1365 kJ (B) +2/30 kJ (C) -2730 kJ (D) -462 kJ .

Tardigrade Admin · Accepted Answer

Correct answer is (d) -462 kJ .

Q. The enthalpies of formation of A12​O3​ and Cr3​O3​ are -1596 kJ and -1134 kJ respectively. ΔH for the reaction 2Al+Cr2​O3​→2Cr+Al2​O3​

-1365 kJ

+2/30 kJ

-2730 kJ

-462 kJ .

Correct answer is (d) -462 kJ .

Q. The enthalpies of formation of $A 1_{2} O_{3}$ and $C r_{3} O_{3}$ are -1596 kJ and -1134 kJ respectively. $Δ H$ for the reaction $2 A l + C r_{2} O_{3} \to 2 C r + A l_{2} O_{3}$