First slide

Enthalpy and enthalpy change

Question

$\begin{array}{l} A_{2} (g) + B_{2} (s) \overset{}{\to} 2 AB (g); ΔH = + 54 kJ \\ A_{2} (g) + B_{2} (g) \overset{}{\to} 2 AB (g); ΔH = - 9 kJ \end{array}$
From the given data, Enthalpy of sublimation of $" B_{2} "$ is

Easy

Solution

Equation (1) - Equation (2)
$B_{2} (s) \to B_{2} (g); ∆ H = [+ 54 - (- 9) = + 63 kJ$

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