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First of all you need a copy of the Periodic Table alongside , showing the atomic masses.

Magnesium hydroxide has the formul. Mg(OH)2 .

We have

1 x Mg = 1 x 24.3 = 24.3 (Atomic Mass)

2 x O = 2 x 16 = 32

2 x H = 2 x 1 = 2

24.3 + 32 + 2 = 58.3 is the formula weight/ molecular weight/ molecular mass of magnesium hydroxide.

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lenpollock

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1y ago

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