What is the sum of the coefficients when the following equation is balanced?
$A l (O H)_{3} + H_{2} S O_{4} \to A l_{2} (S O_{4})_{3} + H_{2} O$

4

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10

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12

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14

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Solution

The correct option is D $12$
$A l (O H)_{3} + H_{2} S O_{4} \to A l_{2} (S O_{4})_{3} + h_{2} O$
The balanced equation is:
$2 A l (O H)_{3} + 3 H_{2} S O_{4} \to A l_{2} (S O_{4})_{3} + 6 H_{2} O$
Sum of all the coefficients is 2+3+1+6=12

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