Which conversion factor should be used to solve the following problem?

How many moles of water (H2O) would be produced from the reaction of 3.25 moles of hydrochloric acid (HCl) reacting with excess calcium hydroxide Ca(OH)2?

Ca(OH)2 +2HCl --> CaCl2 + 2H2O

3.25 mol HCL x ?

Question options:

2 mol HCl / 2 mol H2O

2 mol H2O / 2 mol HCl

2 mol HCl / 1 mol CaCl2

1 mol CaCl2 / 2 mol HCl

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  1. HCl x H2O/HCl = H2O
    Just like any other units that cancel.
    And the equation says the ratio is 2:2

    So, what do you think?

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