Genius Jnr - For the reaction, A2(g)+B2(l)→ 2AB(g) ; ∆fH° = -X kJ mol-1 The enthalpy of formation of AB is :

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For the reaction, $A_{2} (g) + B_{2} (l) \overset{}{\to} 2 AB (g); ∆_{f} H ° = - X kJ {mol}^{- 1}$

The enthalpy of formation of AB is :

−2X

−X

$\frac{- X}{2}$

X

or

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