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Na2CO3.H2O + 2HCl ==> 2H2O + CO2 + 2NaCl
mols Na2CO3.H2O = grams/molar mass = about 0.014 but you need to do it better than that.
mols HCl = M x L = about 0.030
mols CO2 that could be produced from Na2CO3 = 0.014
mols CO2 that could be produced from HCl = about 0.03
In limiting reagent problems the SMALLER number always wins; therefore, the carbonate is the limiting reagent and HCl is the excess reagent.
Therefore, 0.014 mols CO2 will be produced.
grams CO2 = mols CO2 x molar mass CO2 = ?