Question

When 15.0 g of ethyl alcohol, C2H5OH, is dissolved in 750 g of formic acid, the freezing point of the solution is 7.20 C. The freezing point of the pure formic acid is 8.40 C. Evaluate Kf for fomic acid.

Answer 1

-1.2=Kf m

m= 15/(molmassEthanol*.765)

Answer 2

2.76¡ãcm-1