For the formation of Cr2O3 and Al2O3- values of -f G are -540 kJmol-1 and -827 kJmol-1 respectively- What will be the reaction of Cr2O3 by Al-

Cr + 32O_2 → Cr_2O_3; Δ_fG^0= 540 kJ mol^ 1.....(i) 2Al + 32O_2 → Al_2O_3; Δ_fG^0= 827 kJ mol^ 1.....(ii) Substracting equation (i) from (ii), 2Al + Cr_2O_3 → ...

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Byju's Answer

Standard XII

Chemistry

Gibb's Energy and Nernst Equation

For the forma...

Question

For the formation of $C r_{2} O_{3}$ and $A l_{2} O_{3}$ , values of $Δ_{f} G$ are $- 540 k J {mol}^{- 1}$ and $- 827 k J {mol}^{- 1}$ respectively. What will be the reaction of $C r_{2} O_{3}$ by $A l$ ?

Reduction of

C r_{2} O_{3}

, by

A l

will take place

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Oxidation of

C r_{2} O_{3}

A l

will take place

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Neither oxidation nor reduction will take place

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Reaction is not feasible

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Solution

The correct option is A Reduction of $C r_{2} O_{3}$ , by $A l$ will take place
$C r + \frac{3}{2} O_{2} \to C r_{2} O_{3}; Δ_{f} G^{0} = - 540 k J m o l^{- 1} . . . . . (i)$

$2 A l + \frac{3}{2} O_{2} \to A l_{2} O_{3}; Δ_{f} G^{0} = - 827 k J m o l^{- 1} . . . . . (i i)$

Substracting equation (i) from (ii),
$2 A l + C r_{2} O_{3} \to A l_{2} O_{3} + 2 C r$
$Δ_{f} G = [- 827 - (- 540)] = - 287 k J m o l^{- 1}$
$Δ_{f} G = - v e$
Thus, the reduction of $C r_{2} O_{3}$ , takes place and it will be done in the presence of aluminium.

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Similar questions

Q. For the formation of

C r_{2} O_{3}

and

A l_{2} O_{3}

, values of

Δ_{f} G^{o}

are 540 kJ mol

^{- 1}

and -827 kJ mol

^{- 1}

respectively. What will be the possibility for reaction of

C r_{2} O_{3}

by Al?

Q. The value of

Δ_{r} G^{\circ}

for

C r_{2} O_{3}

- 540 {kJ mol}^{- 1}

and that of

A l_{2} O_{3}

- 827 {kJ mol}^{- 1}

. Is the reduction of

C r_{2} O_{3}

A l

is feasible reaction?

Q. The value of

Δ_{f} G^{0}

for

C r_{2} O_{3}

540 {kJ mol}^{- 1}

and that of

A l_{2} O_{3}

- 827 {kJ mol}^{- 1}

. Is the reduction of

C r_{2} O_{3}

A l

is feasible reaction?

Q. Value of

△ G^{\circ}

for formation of

C r_{2} O_{3}

and

A l_{2} O_{3}

are

- 540 k J m o l^{- 1}

and

- 827 k J m o l^{- 1}

respectively. Is reduction possible of

C r_{2} O_{3}

A l

The enthalpies of formation of $A l_{2} O_{3}$ and $C r_{2} O_{3}$ are $- 1569 K J$ and $- 1134 K J$ respectively. $Δ H$ for the reaction

$2 A l + C r_{2} O_{3} \to 2 C r + A l_{2} O_{3}$ is

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For the formation of Cr2O3 and Al2O3, values of ΔfG are −540 kJmol−1 and −827 kJmol−1 respectively. What will be the reaction of Cr2O3 by Al?

For the formation of $C r_{2} O_{3}$ and $A l_{2} O_{3}$ , values of $Δ_{f} G$ are $- 540 k J {mol}^{- 1}$ and $- 827 k J {mol}^{- 1}$ respectively. What will be the reaction of $C r_{2} O_{3}$ by $A l$ ?