Calculate the enthalpy of isomerization of ethanol to dimethyl ether :

${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}\left(l\right)⟶{\mathrm{CH}}_3{\mathrm{OCH}}_3\left(\mathrm{g}\right)$

Given : Enthalpy of vaporisation of ethanol = 41 kJ/mole

 Bond enthalpies

C-C = 348 kJ/mole

C-H = 415 kJ/mole

C-O = 352 kJ/mole 

O-H = 463 kJ/mole