List of top Chemistry Questions on bond energies asked in BITSAT

Given the following data: l c Reaction & Energy change (kJ)
Li(s) → Li(g) & 161
Li(g) → Li⁺(g) & 520
(1)/(2)F₂(g) → F(g) & 77
F(g) + e⁻ → F⁻(g) & ?
Li⁺(g) + F⁻(g) → LiF(s) & -1047
Li(s) + (1)/(2)F₂(g) → LiF(s) & -617 Based on the data provided, the value of electron gain enthalpy of fluorine would be:

For the dissociation reaction, \( \text{H}_2 \rightarrow \text{H} + \text{H} \), \( \Delta H = 162 \, \text{Kcal} \), heat of atomisation of H is

Bond enthalpies of \( H_2 \), \( X_2 \), and \( HX \) are in the ratio 2:1:2. If enthalpy of formation of \( HX \) is -50 kJ/mol\(^{-1}\), the bond enthalpy of \( X_2 \) is: