These videos (and photos) show the steps you should follow to solve a problem like this one, and find the enthalpy change:
When we calculate enthalpy change experimentally, there are many sources of error that we need to be aware of. Heat energy is always gained/lost to the surrounding environment. If enough heat is gained, some of the energy may be absorbed as latent heat (no temperature change would be seen, but evaporation, for example, could occur).
Very special calorimeters (such as bomb calorimeters) are need to get very accurate temperature change data to calculate enthalpy change. They keep the system closed so there is negligible heat loss/gain to the surroundings.
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