In Room 117 Lee Hall chemistry laboratory, a certain liquid was found to have a normal boiling point of 68.9C, initially. When the vapor pressure was decreased by 50%, the boiling point of the same liquid was found to be 48.9C. From the information given, determine the heat of vaporization (in kJ/mol) for the liquid that was in Room 117 Lee Hall. (Note: Report your answer to three significant figures and use the abbreviated form of the unit.)