MCQ
Calculate the $N-N$ bond energy in $N_2H_4$ from given bond enthalpy data.
$\varepsilon_{N-H} = 393\, kJ/mole$
$\varepsilon_{H-H} = 436\, kJ/mole$
$\Delta H_{vap}[N_2H_4(l)] = 18\, kJ / mole$
$N_2H_4(l) + H_2(g) \to 2NH_3(g) : \Delta H = -142\, kJ/mole$

.......$ kJ/mole$

  • A
    $210$
  • $190$
  • C
    $180$
  • D
    $150$

Answer

Correct option: B.
$190$
b

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