If \(20 \text{ g}\) of \(\text{CaCO}_3\) is treated with \(100 \text{ mL}\) of \(20\%\) \(\text{HCl}\) solution, the amount of \(\text{CO}_2\) produced is:
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Always double check the units given in the options! Options (2) and (3) are given in grams (g), while options (1) and (4) are in liters (L). Calculating the mass first saves you from doing an unnecessary conversion to volume.