Question

NH4NO3(s)+H2O(l)→NH4NO3(aq) ΔH = +25.7 kJ.

What is the final temperature in a squeezed cold pack that contains 49.0g of NH4NO3 dissolved in 125 mL of water? Assume a specific heat of 4.18J/(g⋅∘C) for the solution, an initial temperature of 28.5∘C, and no heat transfer between the cold pack and the environment.

Please help. I keep getting an increase in heat, which I know isn't right. But I can't seem to figure out where I went wrong. Please explain! Thanks!
Instead of me guessing what you did wrong why don't you post your work and let me find the error?
It must not have been all that urgent.

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