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.)

c, liquids evaporate, creating a gas

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