# Chemistry

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Limestone (CaCO3) emits CO2 gas when exposed to HCl. What is the theoretical yield of CO2 if 56.1
grams of limestone is completely dissolved in HCl?
CaCO3(s) + 2 HCl(aq) R CaCl2(aq) + CO2(g) + H2O(l)
a. 21.5 g
b. 4.16 g
c. 9.53 g
d. 24.7 g

• Chemistry -

mols CaCO3 = grams/molar mass
Convert mols CaCO3 to mols CO2 using the coefficients in the balanced equation.
Convert mols CO2 to grams. g = mols x molar mass. That is the theoretical yield.

• Chemistry -

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