The standard enthalpy of formation of solid barium oxide, BaO, is −553.5 kJ/mol, and the standard enthalpy of formation of barium peroxide, BaO₂, is −634.3 kJ/mol.

(a) Calculate the standard enthalpy change for the following reaction. Is the reaction exothermic or endothermic? 

(b) Draw an energy level diagram that shows the relationship between the enthalpy change of the decomposition of BaO₂ to BaO and O₂ and the enthalpies of formation of BaO(s) and BaO₂(s).

Transcribed Image Text:

2 BaO,(s) 2 BaO(s) + O2(g)