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The reaction Cr_2O_3+2Al Al_2O_3+2Cr( G^0 = -421 kJ) is thermo

Question

The reaction $C r_{2} O_{3} + 2 A l \to A l_{2} O_{3} + 2 C r (△ G^{0} = - 421 k J)$ is thermodynamically feasible due to -ve value of $△ G .$ Why does this reaction not take place at room temperature?

Certain amount of activation energy is essential for thermodynamically feasible reactions also.

Due to high melting point of chromium oxide the reaction does not take place.

Overall value of

△ G

for the net reaction becomes positive.

Molecules of

C r_{2} O_{3}

and Al are not oriented properly.

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Amelia Discussed

The reaction

C r_{2} O_{3} + 2 A l \to A l_{2} O_{3} + 2 C r (△ G^{0} = - 421 k J)

is thermodynamically feasible due to -ve value of

△ G .

Why does this reaction not take place at room temperature?

6 mins ago

Discuss this question LIVE

6 mins ago

Text solutionVerified

In thermite process,

C r_{2} O_{3} + 2 A l ⟶ A l_{2} O_{3} + 2 C r + Q

It is an exothermic and spontaneous process. It requires more activation energy. At room temperature it does not takes place as activation energy is less.

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Question Text	The reaction $C r_{2} O_{3} + 2 A l \to A l_{2} O_{3} + 2 C r (△ G^{0} = - 421 k J)$ is thermodynamically feasible due to -ve value of $△ G .$ Why does this reaction not take place at room temperature?
Answer Type	Text solution:1
Upvotes	150

The reaction Cr2​O3​+2Al→Al2​O3​+2Cr(△G0=−421kJ) is thermodynamically feasible due to -ve value of △G. Why does this reaction not take place at room temperature?

Text solutionVerified

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The reaction $C r_{2} O_{3} + 2 A l \to A l_{2} O_{3} + 2 C r (△ G^{0} = - 421 k J)$ is thermodynamically feasible due to -ve value of $△ G .$ Why does this reaction not take place at room temperature?