A 2.5 g sample of NH4NO3 is dissolved in 135 g of water in a Styrofoam cup, changing the temperature of the solution from 25.1°C to 19.4°C. What is the heat of solution expressed in kilojoules per mole of NH4NO3? Assume the specific heat of the solution is Cwater = 4.186 J/g°C.

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