2 H2O2(aq) → 2 H2O(l) + O2(g) ΔH° = −196 kJ/mol_rxn The decomposition of H2O2(aq) is represented by — Thermodynamics Chemistry Question
Question
2 H2O2(aq) → 2 H2O(l) + O2(g) ΔH° = −196 kJ/mol_rxn
The decomposition of H2O2(aq) is represented by the equation above. A student monitored the decomposition of a 1.0 L sample of H2O2(aq) at a constant temperature of 300. K and recorded the concentration of H2O2 as a function of time. The results are given in the table below.
[VISUAL]
Assume that the bond enthalpies of the oxygen-hydrogen bonds in H2O are not significantly different from those in H2O2. Based on the value of ΔH° of the reaction, which of the following could be the bond enthalpies (in kJ/mol) for the bonds broken and formed in the reaction?
O–O in H2O2: 300, O=O in O2: 500, O–H: 500
O–O in H2O2: 150, O=O in O2: 500, O–H: 500
O–O in H2O2: 500, O=O in O2: 300, O–H: 150
O–O in H2O2: 250, O=O in O2: 300, O–H: 150