Consider the temperature energy scale for an unknown pure substance (MW =120g/mol) at atmospheric pressure shown below. Note that the tick marks are at 20C intervals for the temperature scale. a) Determine the normal melting point and enthalpy of fusion for this substance. b) Determine the normal boiling point and enthalpy of vapourization for this substance. c) Determine the vapour pressure (in mmHg ) at 200C for this substance