A solution containing 0.5126 g naphthalene (molar mass = 128) in 50.0 g of carbon tetrachloride yields a boiling point elevation of 0.402$^{\large\circ}$C while a solution of 0.6216 g of an unknown solute in the same weight of the same solvent gives a boiling point elevation of 0.647$^{\large\circ}$C. Find the molecular mass of the unknown solute.

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