How can the terms produce and source be used to describe a nations economy?

Carbon tetrachloride, ccl4, was once used as a dry-cleaning solvent, but is no longer used because it is carcinogenic. at 57.8 °c, the vapor pressure of ccl4 is 54.0 kpa, and its enthalpy of vaporization is 33.05 kj/mol. use this information to estimate the normal boiling point for ccl4.