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The white limestone cliffs of Dover, England, contain a large percentage of calcium carbonate(CaCO3). A sample of limestone weighing 84.4g reacts with an excess of hydrochloric acid to form calcium chloride.
CaCO3+2HCl (arrow) CaCl2+H2O+CO2
The mass of calcium chloride formes is 81.8g. What is the percentage of calcium carbonate in the limestone?

Appreciate all the help.

Make sure the equation is balanced.
81.8 g CaCl2 = ?? mols CaCl2.
??mols CaCl2 = mols CaCO3 (from the equation).
mols CaCO3 = ?? grams CaCO3.
%CaCO3 = (g CaCO3/84.4) x 100 = ??
Post your work if you get stuck.

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