How does increasing the amount of water effect an ammonium nitrate endothermic reaction?

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It sounds like you're asking about the heat absorbed by ammonium nitrate when ammonium nitrate dissolves endothermically in water. This means that it absorbs heat from the surroundings, in this case water, causing the water temperature to go down. The amount of heat absorbed by the ammonium nitrate depends on the amount dissolving. The heat of solution of ammonium nitrate is +25.41 kJ/mol.

The amount of heat absorbed by the ammonium nitrate will equal the amount released...

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