How many grams of calcium chloride will be produced when 30.0g of calcium carbonate are combined with 14.0g of hydrochloric acid?

Answer 1

This is a limiting reagent (LR) problem and you know that because amounts are given for BOTH reactants.

CaCO2 + 2HCl ==> H2O + CO2 + CaCl2

mols CaCO3 = grams/molar mass
mols HCl = grams/molar mass

Using the coefficients in the balanced equation, convert mols CaCO3 to mols CaCl2.
Do the same to convert mols HCl to g CaCl2.
It is likely that these two values will not agree which means one of them is wrong; the correct value in LR problems is ALWAYS the smaller value and the reagent responsible for that number is the LR.

Now convert mols CaCl2 to grams. g = mols x molar mass