6. Of the following binary liquid/vapor systems, which can be approximately modeled by Raoults law? For those that cannot, why not? Table B.1 (App. B) may be useful. (a) Benzene/toluene at 1(atm). (b) n-Hexane/n-heptane at 25 bar. (c) Hydrogen/propane at 200 K. (d) Iso-octane/n-octane at 100C. (e) Water/n-decane at 1 bar.