What is the enthalpy change for this reaction per mole of O3 (g)? Express answer to four significant figures.?
Ozone, O3 (g) is a form of elemental oxygen that is important in the absorption of ultraviolet radiation in the stratosphere. It decomposes to O2 (g) at room temperature and pressure according to the following reaction: 2O3 (g) —> 3O2 (g) ΔH= -284.6 kJ
So you have 2O3(g)—-> 3O2(g); meaning that you have 2 moles of O3. Since you’re given ΔH= -284.6 kJ, you’d simply divide by 2.
O3 (g) —-> 1.5O2 (g)
Therefore,
-284.6/2 = -142.3 kJ/1 mol.
What is the enthalpy change for this reaction per mole of o3(g)?