In order to measure the enthalpy change for this reaction, 1.25 g of NH4NO3 is dissolved in enough water to make 25.0mL of solution. The initial temperature is 25.8 C and the final temperature (after the solid dissolves) is 21.9 C. Calculate the change in enthalpy for the reaction in kilojoules per mole. (Use 1.0g/mL as the density of the solution and 4.18 J/g x C as the specific heat capacity.) Include units