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Thermodynamics — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThermodynamics1 Mark
Question
Why does $\mathrm{NH}_4 \mathrm{NO}_3$ dissolve in water spontaneously even when this process is endothermic?
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Answer

$\mathrm{NH}_4 \mathrm{NO}_3$ dissolves in water spontaneously even when this process is endothermic because entropy increasing due to free movement of ions on dissolving. $\Delta\text{S}=+\text{ve}$ favours the process and makes it spontaneous.

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