Chemistry: Coffee-cup calorimeter Help?

In a constant pressure coffee-cup calorimeter, a solution of sodium nitrite will react with ethanol in a 1 to 1 molar ratio. When 1.25 of NaNO2 is added to enough ethanol to make 40.0mL of solution in a calorimeter, the temperature changes from 21.1 degrees C to 27.8 degrees C. Find change in H of reaction, in KJ/mol, for the reaction, using 0.789g/mL for density and 2.42J/(g*degreesC) for Specific heat capacity.