Question

Calcium hydroxide and hydrochloric acid react to form calcium chloride and water as show in the chemical reaction. If the chemicals are present in exactly the correct ratios to fully use all of the ingredients, how many moles of water would be formed from 5 moles of HCI

Answer 1

5 moles H2O

Step-by-step explanation:

We need a balanced equation for the reaction.

Ca(OH)2 + 2HCl = CaCl2 + 2H20

Everything should be balanced. This tells us we should expect 2 moles of H2O from 2 moles of HCl. That is a 1:1 molar ratio, or

(1 mole H2O/1 mole HCl)

If we start with 5 moles of HCl, we can use the molar ratio:

(5 moles HCl)*((1 mole H2O/1 mole HCl) = 5 moles H2O (the unit "moles HCl" cancels out, leaving just moles H2O)