Question

1. 4mg(oh)₂ mg= o= h=

Explanation:

Step1: Determine the number of each atom in one formula unit

In one formula unit of $Mg(OH)_2$, there is 1 Mg atom, 2 O atoms, and 2 H atoms.

Step2: Multiply by the coefficient

We have 4 formula - units of $Mg(OH)_2$.
For Mg: The number of Mg atoms is $4\times1 = 4$.
For O: The number of O atoms is $4\times2=8$.
For H: The number of H atoms is $4\times2 = 8$.

Answer:

Mg = 4, O = 8, H = 8