What is ΔH°_rxn for the following reaction? 2H₂O₂(l) → 2H₂O(l) + O₂(g) ΔH°_f(H₂O(l)) = -285.8 kJ/mol, ΔH°_f(H₂O₂(l)) = -187.6 kJ/mol A) -196.4 kJ/mol B) 98.2 kJ/mol C) -98.2 kJ/mol D) -473.4 kJ/mol E) -946.8 kJ/mol

Question

Quizplus · Accepted Answer

ΔH°_rxn = ΣΔH°_f(products) - ΣΔH°_f(reactants) ΣΔH°_f(products) = 2ΔH°_f(H₂O(l)) + ΔH°_f(O₂(g)) = 2(-285.8 kJ/mol) + (0 kJ/mol) = -571.6 kJ/mol ΣΔH°_f(reactants) = 2ΔH°_f(H₂O₂(l)) = 2(-187.6 kJ/mol) = -375.2 kJ/mol ΔH°_rxn = (-571.6 kJ/mol) - (-375.2 kJ/mol) = -196.4 kJ/mol Therefore, the best choice is A, and this is the only correct answer choice.

What Is ΔH°rxn for the Following Reaction? 2H2O2(l) → 2H2O(l)

What Is ΔH°_rxn for the Following Reaction? 2H₂O₂(l) → 2H₂O(l)