Calculate - H for the following reaction-8Als-3Fe3O4s-4Al2O3s-9FesGiven - Hf for Al2O3s and Fe3O4s are -1669-8 kJ and -1120-9 kJ respectively-

Given, Δ H_f(Al_2O_3(s))= 1669.8 kJ and Δ H_f(Fe_3O_4(s))= 1120.9 kJ the reaction is nbsp;8Al(s)+3Fe_3O_4(s)→4Al_2O_3(s)+9Fe(s) as per convention Δ H_f(Fe ...

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Standard XIII

Chemistry

Heat of Reaction

Calculate Δ H...

Question

Calculate $Δ H$ for the following reaction:
$8 A l (s) + 3 F e_{3} O_{4} (s) \to 4 A l_{2} O_{3} (s) + 9 F e (s)$
Given $Δ H_{f}$ for $A l_{2} O_{3} (s)$ and $F e_{3} O_{4} (s)$ are -1669.8 kJ and -1120.9 kJ respectively.

-3316.5 kJ

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-3650.4 kJ

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-2650.4 kJ

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None of the above

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Solution

The correct option is A -3316.5 kJ
Given, $Δ H_{f} (A l_{2} O_{3} (s)) = - 1669.8 k J$ and $Δ H_{f} (F e_{3} O_{4} (s)) = - 1120.9 k J$

the reaction is $8 A l (s) + 3 F e_{3} O_{4} (s) \to 4 A l_{2} O_{3} (s) + 9 F e (s)$

as per convention
$Δ H_{f} (F e (s)) = 0 k J, Δ H_{f} (A l (s)) = 0 k J$

We know that $Δ H$ for a reaction $= \sum Δ H_{f} (p r o d u c t s) - \sum Δ H_{f} (r e a c t a n t s)$

$= 4 Δ H_{f} (A l_{2} O_{3} (s)) + 9 Δ H_{f} (F e (s)) - 3 Δ H_{f} (F e_{3} O_{4} (s)) - 8 Δ H_{f} (A l (s))$

$= 4 \times - 1669.8 + 3 \times 1120.9$
$= - 3316.5 k J$

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Similar questions

Q. Calculate

Δ H

for the following reaction:

8 A l (s) + 3 F e_{3} O_{4} (s) \to 4 A l_{2} O_{3} (s) + 9 F e (s)

Given

Δ H_{f}

for

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

and

F e_{3} O_{4} (s)

are -1669.8 kJ and -1120.9 kJ respectively.

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

Q. The enthalpies of formation of

A l_{2} O_{3}

and

C r_{2} 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}

is :

Δ H_{f}^{\circ}

F e_{2} O_{3}

and

A l_{2} O_{3}

are -189 kJ and -405 kJ respectively. How much heat (in kJ) is given out during reaction of 1 g Al according to

2 A l + F e_{2} O_{3} ⟶ A l_{2} O_{3} + 2 F e

Q. In the reaction,

8 A l + 3 F e_{3} O_{4} \to 4 A l_{2} O_{3} + 9 F e,

number of electrons transferred from reductant to oxidant is:

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Heat of Reaction

Standard XIII Chemistry

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Calculate ΔH for the following reaction: 8Al(s)+3Fe3O4(s)→4Al2O3(s)+9Fe(s) Given ΔHf for Al2O3(s) and Fe3O4(s) are -1669.8 kJ and -1120.9 kJ respectively.

Calculate $Δ H$ for the following reaction:
$8 A l (s) + 3 F e_{3} O_{4} (s) \to 4 A l_{2} O_{3} (s) + 9 F e (s)$
Given $Δ H_{f}$ for $A l_{2} O_{3} (s)$ and $F e_{3} O_{4} (s)$ are -1669.8 kJ and -1120.9 kJ respectively.