Calculate the molecular weight of the following substance
Aluminum Hydroxide $Al {(OH)}_{3}$

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Solution

The molecule of Aluminum Hydroxide $Al {(OH)}_{3}$ contains one aluminum atom(Atomic weight=27), three oxygen atoms(Atomic weight=16), and three Hydrogen atoms(Atomic weight=1).
The molecular weight of the Aluminum Hydroxide $Al {(OH)}_{3}$ will be $(1 \times 27) + (3 \times 16) + (3 \times 1) = 78 amu$ .

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