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Properties and Uses of Calcium Oxide

Aluminium bui...

Question

Aluminium building materials have a hard transparent protective coating of aluminium oxide formed by reaction with oxygen in air. The sulphuric acid, $H_{2} S O_{4}$ , in acid rain dissolves this protective coating and forms aluminium sulphate and water.
If $H_{2} S O_{4}$ reacts with $4.0$ moles of $A l_{2} O_{3}$ , how many moles of $A l_{2} (S O_{4})_{3}$ are formed?

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Solution

$A l_{2} O_{3} + 3 H_{2} S O_{4} ⟶ A l_{2} (S O_{4})_{3} + 3 H_{2} O$
$1 m o l$ $3 m o l$ $1 m o l$
$4 m o$ l $12 m o l$ $4 m o l$
$H_{2} S O_{4} r e q u i r e d = 12 m o l$
$A l_{2} (S O_{4})_{3} f o r m e d = 4 m o l$

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