The standard formation reaction for aluminium oxide is 4Als - 6Og- 2Al2O3s- This statement is false because-

The correct option is B the reaction should be written for one mole of Al 2Al+3O_2→ Al_2O_3 The #160;enthalpy of the above #160;reaction is #160;entha ...

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Standard XII

Chemistry

Physical and Chemical Properties of Hydrogen

The standard ...

Question

The standard formation reaction for aluminium oxide is $4 A l (s) + 6 O (g) \to 2 A l_{2} O_{3} (s)$ . This statement is false because:

aluminium is not in its standard state

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the reaction should be written for one mole of Al

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The reaction is prevented by a thin film of

A l_{2} O_{3}

formed on the surface of Al

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none of these

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Solution

The correct option is B the reaction should be written for one mole of Al
$2 A l + 3 O_{2} \to A l_{2} O_{3}$

The enthalpy of the above reaction is enthalpy of formation as one mole of $A l_{2} O_{3}$ is forming from elemental aluminum and oxygen gas.

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Similar questions

Q. Given the information below, what is the standard enthaply of formation for

A l_{2} O_{3} (s)

2 A l_{2} O_{3} (s) \to 4 A l (s) + 3 O_{2} (g); Δ H_{R X N}^{o} = 3352 k J

A l

and

K C l O_{3}

react together to form

A l_{2} O_{3}

as follows:

2 K C l O_{3} ⟶ 2 K C l + 3 O_{2}

4 A l + 3 O_{2} ⟶ 2 A l_{2} O_{3}

4

moles of

K C l O_{3}

(

50 %

pure) on reaction with excess of

A l

forms x moles of

A l_{2} O_{3}

. The value of x (as nearest integer) is:

A l

and

K C l O_{3}

react together to form

A I_{2} O_{3}

according to the following reaction:

2 K C l O_{3} ⟶ 2 K C l + 3 O_{2}

4 A l + 3 O_{2} ⟶ 2 A l_{2} O_{3}

4

moles of

K C l O_{3}

(

50 %

pure) on reaction with excess of

A l

forms

A l_{2} O_{3}

equal to :

Q. In the reaction

3 M n O_{2} + 4 A l \to 3 M n + 2 A l_{2} O_{3}

the oxidizing agent is:

Q. Reaction for which enthalpy of reaction is equal to standard enthalpy of formation:

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The standard formation reaction for aluminium oxide is 4Al(s)+6O(g)→2Al2O3(s). This statement is false because:

The correct option is B the reaction should be written for one mole of Al2Al+3O2→Al2O3The enthalpy of the above reaction is enthalpy of formation as one mole of Al2O3 is forming from elemental aluminum and oxygen gas.

The standard formation reaction for aluminium oxide is $4 A l (s) + 6 O (g) \to 2 A l_{2} O_{3} (s)$ . This statement is false because:

The correct option is B the reaction should be written for one mole of Al
$2 A l + 3 O_{2} \to A l_{2} O_{3}$

The enthalpy of the above reaction is enthalpy of formation as one mole of $A l_{2} O_{3}$ is forming from elemental aluminum and oxygen gas.