Ihave been out of school for 20yrs and i am taking a high school level chemistry class that i must pass for my adult studies.

i have a series of chemistry questions that i desperately need to get answered.

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.