Addition of impurity into water lowers the freezing point of water.

If 10.0 g of a non-electrolyte dissolved in 100 g of water lowers the freezing point of water by 1.86^(@)C , the molar mass of the non-electrolyte is ( K_(f)=1.86 Km^(-1) )

What mass of ethylene glycol (molar mass = 62.0 g mol^(-1) ) must be added to 5.50 kg of water to lower the freezing point of water from 0^(@)C to - 10.0^(@) C ? (K_(f) "for water " = 1.86 k " kg mol"^(-1))

What mass of NaCl must be dissolved in 65.0 g of water for lowering the freezing point of water by 7.50^(@)C ? The freezing point depression constant (K_(f)) for water is 1.86^(@) C/m. Assume Van't Hoff factor for NaCL is 1.87 (molar mass of NaCl = 58.5 g )

If K_(f) for water is 1.86^(@)C"mol"^(-1) , a 0.1 m solution of urea in water will have the freezing point of

A certain substance A tetramerizes in water to the extent of 80% . A solution of 2.5 g of A in 100 g of water lowers the freezing point by 0.3^(@)C . The molar mass of A is a. 120 , b. 61 ,c. 60 ,d. 62