The reaction is $CaCO_3+CO_2+H_2O\to Ca^{2+}+2HCO_3^-$. It consumes one mole CO₂ per mole carbonate. One litre contains one mole carbonate, requiring1×44=**44 g, A**. The litre-to-millilitre conversion is not needed because molarity is already per litre.
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