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Molar and Specific Heat Capacity

For the forma...

Question

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?

A

Reduction of

C r_{2} O_{3}

by Al will take place

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B

Oxidation of

C r_{2} O_{3}

by Al will take place

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C

Neither oxidation nor reduction will take place

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D

Reaction is not feasible

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Solution

The correct option is A Reduction of $C r_{2} O_{3}$ by Al will take place
$2 C r + \frac{3}{2} O_{2} \to C r_{2} O_{3}; Δ_{f} G^{o} = - 540 k J m o l^{- 1}$ ...(i)
$2 A l + \frac{3}{2} O_{2} \to A l_{2} O_{3}; Δ_{f} G^{o} = - 827 k J m o l^{- 1}$ ...(ii)

Subtracting equation (i) from (ii):

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

$Δ_{f} G = [- 827 - (- 540)] k J m o l^{- 1} = - 287 k J m o l$

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Similar questions

Q. For the formation of

C r_{2} O_{3}

A l_{2} O_{3}

Δ_{f} G

- 540 k J {mol}^{- 1}

- 827 k J {mol}^{- 1}

respectively. What will be the reaction of

C r_{2} O_{3}

A l

?

Q. The value of

Δ_{r} G^{\circ}

C r_{2} O_{3}

- 540 {kJ mol}^{- 1}

A l_{2} O_{3}

- 827 {kJ mol}^{- 1}

. Is the reduction of

C r_{2} O_{3}

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is feasible reaction?

Q. The value of

Δ_{f} G^{0}

C r_{2} O_{3}

540 {kJ mol}^{- 1}

A l_{2} O_{3}

- 827 {kJ mol}^{- 1}

. Is the reduction of

C r_{2} O_{3}

A l

is feasible reaction?

△ G^{\circ}

for formation of

C r_{2} O_{3}

A l_{2} O_{3}

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

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

respectively. Is reduction possible of

C r_{2} O_{3}

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Q. The value of

Δ_{f} G^{0}

for formation of

C r_{2} O_{3}

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

A l_{2} O_{3}

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

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C r_{2} O_{3}

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