Final answer:
To find the enthalpy of solution for ethylenediamine, average the heat released from the last two trials and divide by the number of moles, considering the specific heat capacity of water and the change in temperature.
Step-by-step explanation:
Calculating Enthalpy of Solution for Ethylenediamine
To calculate the enthalpy of solution (ΔHsoln) for ethylenediamine, we need to use the heat released from calorimetry experiments. If the heat released in the last two trials is slightly different, we can use the average value for a more accurate ΔHsoln calculation. The general formula for calculating the heat released in a solution can be stated as q = m × c × ΔT, where q is the heat released, m is the mass of the solution, c is the specific heat capacity (for water it is approximately 4.18 J/g°C), and ΔT is the change in temperature. To find the ΔHsoln per mole, we divide the heat released by the number of moles of ethylenediamine dissolved.
Remember, ΔHsoln is the enthalpy change when one mole of a solute is dissolved in a sufficient amount of solvent to form a solution in which further dilution would not cause heat to be absorbed or evolved.