An unknown substance has a boiling point of 150°C at 650 torr,and a boiling point of 195°C at 780 torr.What is the heat of vaporization?
A) 22.2 kJ/mol
B) 12.6 kJ/mol
C) 6.67 kJ/mol
D) 29.4 kJ/mol
E) 18.4 kJ/mol
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