Question

An experiment was performed to determine the $\Delta$H_soln of the dissolution process of urea(CO(NH₂)_2(s)) in water.
95.91 grams of water was put in a calorimeter and 13.5 grams of solid urea was added. The initial temperature of
Water is the same as that of urea. Below is a graph describing the temperature change over time of a process
Dissolving the urea in the water.

A. What is the change in temperature due to the dissolution of urea?
B. Based on the graph, determine whether Urea dissolving process is endothermic or exothermic.explain.

C. Assuming that the specific heat of urea and water is 4.2 $J\cdot g^{-1}\cdot ^{\circ}C^{-1}$
(i)Calculate the amount of heat that accompanies the described dissolution of urea In units of joules. Show calculations.
(ii) calculate $\Delta$H_soln, the change in the molecular dissolution of urea, using    units . See calculations.

D.  $\Delta$H_{soln = 14.0} , $\Delta$G_{soln =-6.9} Calculate the $\Delta$H_soln at 298 K. Show calculations.

E. A new experiment was performed with the same amount of urea, but this time dissolved urea
Which was at 5C C in water that was 25^oC . What effect, if any, would this fact have on
calculating the value of $\Delta$H_soln, explain.

Thank you!