Given the following reaction:

Mg(OH)2 + 2HCI -> MgCl2 + 2H2O

How many moles of MgCl, will be produced from 32.0 g of Mg(OH)2, assuming HCl is available in excess?
moles (round to three significant figures)

Approximately (three significant figures.)

Explanation:

Make sure that the reaction here is balanced. Look up a modern periodic table for the relative atomic mass data:

Calculate the formula mass for :

.

Calculate the number of moles of formula units in that of :

.

In the balanced equation for the reaction, the coefficient of is the same as that of . In other words, for each mole of formula units that this reaction consumes, one mole of will be produced. Therefore:

.

(Rounded to three significant figures.)

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.