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When CaCO3 is added to HCl, CaCl2, CO2, and H2O are produced. 


How many g of CaCl2 will be made when 27g CaCO3 are combined with 12g HCl?


Which reactant is in excess and how many g of this reactant will remain after the reaction is complete?

__g of CaCO3 or HCl?

Oct 16th, 2014

Molar mass of CaCO3 is 100.1g

therefore moles of CaCO3 reacting= 27g/100.1g


moles of HCl reacting=12g/36.5g   molar mass of HCl is 36.5g


since mole ratio is 1:2,it means CaCO3 is in excess, therefore the amount that reacted was



therfore moles of CaCl2 is 0.1644 moles, But since molar mass of CaCl2 is 110.984 g

grms of CaCl2 will be 0.1644 moles * 110.984


the excess reactant is CaCO3 BY


0.1053 M *100.1g

=10.54 grams

Oct 16th, 2014

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