30. Answer the questions from (a) to (e) based on the following case: A student conducted an experiment to determine the enthalpy change H of solution (hydration) of sodium chloride NaCl in water. The initial temperature is 20C and the final temperature after dissolving the NaCl in water is 17C. The student calculated the H to be 54kJ/mol (the experimental value), while the reference value H of is 49kJ/mol. a. When sodium chloride is dissolved in water, the water is the and the sodium chloride salt is the i. Solution, solvent. ii. Solute, solvent. iii. Solvent, solute. iv. Solute, solution. b. Enthalpy change H is defined as: i. The kinetic energy per mole of a substance. ii. The heat energy per mass in grams of a substance. iii. The physical energy per mass in grams of a substance. iv. The heat energy transferred into/out of a process per mole of a substance. c. The \% error of the student's value for H is (show your calculation). i. 0.10204% ii. 10.20408%. iii. 0.09259% iv. 9.25926% d. Dissolving NaCl in water is , as T is i. Endothermic, negative. ii. Endothermic, positive. iii. Exothermic, negative. iv. Exothermic, positive. e. Based on your answer in question 32-d, the sign of H will be: i. Positive. ii. Negative