4. 0.5*10-3 kg of non-volatile substance A is dissolved in 9.0*10-3 kg of liquid nitrogen. The boiling point of the solution increases by 0.05 °C compared to the normal boiling point of pure nitrogen, equal to 195.8 °C. The specific heat of evaporation of nitrogen is 199.4*103 J/kg. Calculate the molecular mass of substance A.

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