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A student does an experiment to determine a value for the enthalpy of solution for
ammonium nitrate.
The student uses this method.
• Measure 25.0 cm3 of distilled water in a measuring cylinder.
• Pour the water into a beaker.
• Record the temperature of the water in the beaker.
• Add 4.00 g of solid NH4NO3 to the water in the beaker.
• Stir the solution and record the lowest temperature reached.
Table 2 shows the student’s results.
Table 2
Initial temperature / °C 20.2
Lowest temperature / °C 12.2
Calculate the enthalpy of solution, in kJ mol−1, for ammonium nitrate in this
experiment.
Assume that the specific heat capacity of the solution, c = 4.18 JK−1 g−1
Assume that the density of the solution = 1.00 gcm−3ÂÂ
AQA A-level CHEMISTRY Paper 3 2026 36pages
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