Question

How many hydroxide ions are in 2.5 mol Mg(OH)2?

Answer 1

There are `5.0` moles hydroxide ions in `2.5` moles magnesium hydroxide.

Explanation:

The chemical formula `"Mg(OH)"_2` indicates that there are two moles of hydroxide ions in each mole of the compound.

To determine the number of hydroxide ions in `"2.5 mol Mg(OH)"_2`, multiply the moles of the compound by `("2 mol OH"^(-))/(1"mol Mg(OH)"_2)`.

`2.5color(red)cancel(color(black)("mol Mg(OH)"_2))xx(2"mol OH"^(-))/(1color(red)cancel(color(black)("mol Mg(OH)"_2)))="5.0 mol OH"^(-)"`