Very confused !

Be sure to answer all parts. Ethanol (CH3CH2OH) is being used as a gasoline additive or alternative in many parts of the world. (a) Use bond energies to find the H combusfon of gaseous ethanol. (Assume H2O forms as a gas.) (b) In its standard state at 25C, ethanol is a liquid. Its vaporization requires 40.5kJ/mol. Correct the value from part (a) to find the heat of combustion of liquid ethanol. (c) How does the value from part (b) compare with the value you calculate from standard heats of formation? (a) x) (b) kJ (c) The answers differ by less than 10kJ The answers differ hv mare than 10LT