The volume of the flask is 500 mL or 0.5 L.
- Initial concentration of \( \mathrm{Cl}_2 \) is \( \frac{0.20 \, \text{mol}}{0.5 \, \text{L}} = 0.40 \, \text{M} \).
- Initial concentration of \( \mathrm{HCl} \) is \( \frac{1.9 \, \text{mol}}{0.5 \, \text{L}} =
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