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Stoichiometric Calculations

Alg + O2g⟶ Al...

Question

$A l_{(g)} + O_{2 (g)} ⟶ A l_{2} O_{3 (g)}$
When the equation for the reaction represented above is balanced and all coefficients are reduced to lowest whole number terms, the coefficient for $A l_{(g)}$ is :

A

1

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B

2

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C

3

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D

4

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E

6

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Solution

The correct option is D $4$
The balanced equation can be written as
$4 A l$ $+$ $3 O_{2}$ $=$ $2 {A l}_{2} O_{3}$
Thus the co-efficient of $A l$ is 4. Option D is correct

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