When one mole of calcium carbonate (CaCO3) reacts with one mole of hydrochloric acid (HCl), it produces one mole of carbon dioxide (CO2), at S.T.P one mole of carbon dioxide's density is 0.00195g/cm3 and weight of one mole of carbon dioxide is around 44gms so the volume of carbon dioxide corresponds to 22,400cm3.
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