Question

2. Given the enthalpy of hydrogenation of benzene (C.He reacts with Hy forming C u) (4,H"=+215 k/mol), the enthalpy of combustion of benzene (CHs reacts with O, forming Co, and H.0) (A_H" = -3268 kJ/mol and the reaction enthalpy of water decomposition (liquid H2O becomes Hy and Orgases) (A,Hº = +286 kJ/mol, what is the enthalpy of combustion of cyclohexane (4 H°). (hint: write all balanced equations, use Hess' Law) (15 pts)

Answer 1

Amswer Hadegonation ob benzene eadion The A H + 215 KIm heeacion Carep ondingtohe CHe& Ceu (Comalual ion) are CH +O AeHs-3268 g 6 CO2 3 H20 > Jto Here te enthalp a water decmpartion a AH +286 Kamot =286 Kaad AHS So, tDe baunalion db enthalp ob water iCeH 90 6 CO2+ 6H20 Muthiplgeng SE Cx1 + x3 Jesuling epon e) X-) we get CGH1 (AH 215 ka/ CG t6 3H2 So, he enthalgo Comd ion ob oherane s (-3263 +3(-286) +215 Ka d - 3911