Stoichiometry question number 1?

Question

please do not just solve these for the answer, but give a brief explanation as to how you got them, so I can refresh my memory on how to do this branch of Chemistry again. Thanks!!!

1. Several brands of antacid tablets use aluminum hydroxide to neutralize excess acid.

Al(OH)3(s) + 3HCl(aq) --> AlCl3(aq) + 3H20(l)

What quanity of HCl, in grams, can a tablet with 0.750g of Al(OH)3 consume? What quantity of water is produced?

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thanks!

Answer 1

1 Al(OH)3(s) + 3HCl(aq) --> AlCl3(aq) + 3H20(l)

find moles using molar mass:

0.750 g Al(OH)3  @ 78.00 g/mol = 0.009615 moles of Al(OH)3

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What quanity of HCl, in grams,

find moles:

0.009615 mol Al(OH)3  @ 3 mol HCl / 1 mol Al(OH)3 = 0.0288 moles HCL

find grams using molar mass:

0.0288 moles HCL @ 36.46 g/mol =

your answer : 1.05 grams HCl

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What quantity of water is produced?

the moles of H2O = moles HCl

find grams using molar mass:

0.0288 moles H20  @ 18.02 g/mol =

your answer : 0.520 grams H2O