When ammonium nitrate, NH4NO3(s) is added to water at 25 °C, it dissolves spontaneously and the temperature of the solution decreases. This indicates that the factor causing the substance to dissolve is a change in ________.Group of answer choicestemperatureenergyenthalpyentropy
Question
When ammonium nitrate, NH4NO3(s) is added to water at 25 °C, it dissolves spontaneously and the temperature of the solution decreases. This indicates that the factor causing the substance to dissolve is a change in ________.Group of answer choicestemperatureenergyenthalpyentropy
Solution
The factor causing the substance to dissolve is a change in entropy.
Here's why:
When ammonium nitrate dissolves in water, the process is endothermic, meaning it absorbs heat from the surroundings, which is why the temperature of the solution decreases. However, the process is spontaneous, meaning it occurs without the need for additional energy to be added.
In thermodynamics, a process is spontaneous if it leads to an increase in the total entropy of the universe. Entropy is a measure of the randomness or disorder of a system. When ammonium nitrate dissolves, the ions become dispersed in the water, leading to an increase in disorder, or entropy.
Therefore, the factor causing ammonium nitrate to dissolve is a change in entropy.
Similar Questions
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