Is this right?

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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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4. A calorimeter contains 500 g of water at 25°C. You place a cold pack containing 100 g of crystalline ammonium nitrate inside the calorimeter. When the ammonium nitrate finishes dissolving, the temperature of the water inside the calorimeter is 9.3°C. The specific heat of water is 4.18 J/g–°C. What is the enthalpy of fusion (Hf) of the ammonium nitrate? (Show your work.) Where necessary, use q = mHf.
E= 500*4.18*(9.3-25) = -32813J
Ya that looks good to me!

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Other answers:

I think there is some problem with the sign, besides I think it is not enthalpy of fusion but heat of solution or enthalpy of the reaction. Negative means energy is being releases from the reaction because the final energy is smaller than the initial, so it's exothermic, then the water temperature should rise. What do you think?

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