You add 5.5 gg iron to 28.00 mLmL of water and observe that the volume of iron and water together is 28.70 mLmL . Calculate the density of iron. Express your answer to two significant figures with the appropriate units.

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.