Which compounds have the empirical formula ch2o?

a. c2h4o2

b. c3h6o3

c. ch2o2

d. c5h10o5

e. c6h12o6

How much would the freezing point of water decrease if 4 mol of sugar were added to 1 kg of water(k=1.86 c/mol/kg for water and i=1 for sugar

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

4.25g sample of solid ammonium nitrate dissolves in 60.0g of water in a coffee-cup calorimeter, the temperature drops from 22.0 c to 16.9 c. assume that the specific heat of the solution is the same as that of pure water. calculate delta(h) (in kj/mol nh4no3) for the solution proces.