Question

How many grams of mg(OH)2 would get if you started with 5.0 g

Answer 1

Givens.

There are 5 grams of Magnesium Hydroxide Mg(OH)2.

The chemical equation is

`Mg(OH)_2+\text{HCl}\to MgCl_2+H_2O`

We need to balance the chemical equation.

`Mg(OH)_2+2HCl\to MgCl_2+2H_2O`

Observe that we add coefficients to HCl and H2O in order to have the same amount of atoms on each side.

Now, let's find how much MgCl2 would be produced from 5 grams of Mg(OH)2.

First, let's find the molar mass of MgCl2.

`\begin{gathered} Mg=24.305 \\ Cl_2=2(35.453)=70.906 \\ \text{Total:}24.305+70.906=95.211 \end{gathered}`

The molar mass of MgCl2 is 95.211.

Then, find the molar mass of Mg(OH)2 using the same process. Remember that the molar mass of each element can be found in the periodic table. The molar mass of Mg(OH)2 is 58.3197.

Then, we use the ratio from the stoichiometry coefficients 1:1, that is, 1 mole of Mg(OH)2 produces 1 mole of MgCl2.