To calculate the molarity of the solution, we can use the formula:

$$Molarity (M) = \frac{Moles \ of \ Solute}{Volume \ of \ Solution \ (in \ Liters)}$$

Here, we have 0.202 mol of KCl and 7.98 L of solution. Substituting these values into the formula, we get:

$$Molarity = \frac{0.202 \ mol}{7.98 \ L} \approx 0.0254 \ M$$

Therefore, the molarity of the solution is approximately 0.0254 M.