Answer:
The process is endothermic.
Heat is 26,9 kJ/mol
Explanation:
The dissolution of NH₄NO₃ in water is:
NH₄NO₃ → NH₄⁺ + NO₃⁻
As the change of temperature in the cup is ΔT = -3,82°C
<em>The process is endothermic</em>. Because the temperature is decreasing in the process. That means the process needs heat.
Assuming the heat capacity of the solution is 4.18 J/Kg
:
q = -C×m×ΔT
Where q is heat, C is heat capacity (4,18J/Kg), m is mass (105g) and ΔT is change in temperature (-3,82°C)
q = 1677 J ≈ <em><u>1,68kJ</u></em>
The moles of NH₄NO₃ dissolved are:
5,00g × (1mol / 80,043g) = <em><u>0,0625 moles</u></em>
That means heat of this process in kJ/ mol is:
1,68kJ / 0,0625moles = <em>26,9 kJ/mol</em>
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I hope it helps!
