The mole fraction is given by the formula:
\[X_s = \frac{W_s}{M_s} + 50\]
where \(W_s\) is the weight of the solvent and \(M_s\) is the molecular weight of the solvent. Substituting the given values, we get:
\[X_s = \frac{W_s}{62.1} + 50\]
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