A solution was made by dissolving 3.75 g of a pure non-volatile solute in 95 g of acetone. The boiling point of pure acetone was observed to be 55.95°C, and that of the solution was 56.50°C. If the molar boiling point elevation constant (K) of acetone is 1.71°C kg/mol, what is the approximate molar mass of the solute?