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Standard XII

Chemistry

Stoichiometry

How much ther...

Question

How much thermal energy released when 36.0 g of Al reacts with excess of $F e_{2} O_{3}$ :

568 kJ

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639 kJ

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1.14 \times 10^{3} k J

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1.27 \times 10^{3} k J

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Solution

The correct option is A 568 kJ
The molar mass of $A l$ is $27$ g/mol.
$2$ moles of $A l$ weighs $2 \times 27 = 54 g$
They release $851.4 k J$ of energy when they react with excess ferric oxide.
When $36.0$ g of $A l$ react with excess ferric oxide, the energy released is $\frac{36}{54} \times 851.4 = 568$ kJ.

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Similar questions

Q. A mixture of ferric oxide

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How much thermal energy released when 36.0 g of Al reacts with excess of Fe2O3:

The correct option is A 568 kJThe molar mass of Al is 27 g/mol.2 moles of Al weighs 2×27=54gThey release 851.4kJ of energy when they react with excess ferric oxide.When 36.0 g of Al react with excess ferric oxide, the energy released is 3654×851.4=568kJ.

How much thermal energy released when 36.0 g of Al reacts with excess of $F e_{2} O_{3}$ :