1. 1.25g of a compound when dissolved in 15mls of benzene lowers the freezing point of benzene from -6 degrees celsuis to -8.5 degrees celsuis. The Kfp of benzene is -3.5kg/mol degree celsuis. calculate the molar mass of the compound.
a. When 3.5g of salt is dissolved in 50mls of water the freezing point of water is lowered to -1.5 degree celsuis. the Kfp of water is -1.81kg.mole/ degree celsuis. calculate the molar mass of the compound.
b. What would be the number of ions present in a solution of an electrolyte if the freezing point is lowered to -5.1 degree celsuis. given that a non-electrolyte of the same concentration as the electrolyte lowers the freezing point of the same to a temperature of 1.7 degree celsuis.
c. caluculate the molality of a solution if 2.5 grams of sucrose C12H22O11 is dissolved in 25 mls of water. atomic masses in g/mol: C=12.01, H=1.008, O=16.0 density of water = 0.99g/ml
d .calculate the mole fraction of the solute in problem 4.
e. if the boiling point of benzene is 80 C, and the boling point of a solution containing 0.25g of mls of benzene is 81