The value of ΔH° for the decomposition of calcium chloride into its constituent elements, CaCl₂ (s) → Ca (s) + Cl₂ (g)
Is ________ kJ/mol.

Question

The value of ΔH° for the decomposition of calcium chloride into its constituent elements, CaCl₂ (s)→ Ca (s)+ Cl₂ (g) Is ________ kJ/mol.

Quizplus · Accepted Answer

The decomposition of calcium chloride into its elements is the reverse of its formation. The standard enthalpy change for the formation of CaCl2 is -795.8 kJ/mol, so the reverse process (decomposition) would have a ΔH° of +795.8 kJ/mol.

The Value of ΔH° for the Decomposition of Calcium Chloride