Introduce Thiele modulus (\phi = R\sqrtk/D_e) and dimensionless concentration (c = C/C_s).
Despite copyright restrictions, the solution manual circulates in underground academic channels. Here are the (for educational reference only): from a professor during office hours)
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Additionally, many universities have where graduate TAs can walk you through Smith’s problems without handing out a full solucionario. from a professor during office hours)