Question

Temperature (°C) Time A studented sample of NH, NO.() to water and measured the temperature over time. The data are shown in the graph above What is the of the student should use to caldate

please help!!!

Answer 1

a)

The temperature decreases from $24.8^{0}C$ to $22.2^{0}C$ .

So to calculate enthlpy of dissolution process the temperature difference used to be

= $24.8^{0}C$ - $22.2^{0}C$

= $2.6^{0}C$

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b)

According to graph temperature of system decreases over the time . So dissolution of ammonium nitrate in water is Endothermic process.

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c)

In an endothermic process the solute-solvent interactions ( after dissolution) is less than the solute-solute and solvent-solvent interactions ( before dissoluition)

Solute is Ammonium nitrate

Sovent is water

Energy is requred to break the bonds between solute-solute interactions and water -water particles interactions in this process. Due to this energy is absorbed and temperature of solute+ solvent system decreases.