Question

The enthalpy of combustion at 25°C of H₂, cyclohexane (C₆H₁₂) and cyclohexene (C₆H₁₀) are –241, –3920 and –800 KJ / mole respectively. The heat of hydrogenation of cyclohexene is.

• A. – 121 KJ / mole
• B.
  • 121 KJ / mole
• C. – 242 KJ / mole
• D.
  • 242 KJ / mole

Answer 1

Answer: (A)

– 121 KJ / mole

Answer 2

(i) $dE$

(ii) $\Delta G$

(iii) $\Delta G$

$\Delta S$

Eq. (i) + Eq. (ii) – Eq. (iii)

$\Delta G$

$\Delta H$