Question

There is formation of H₂O₂ in the upper atmosphere

H₂O + O$\longrightarrow$ 2OH $\longrightarrow$H₂O₂

D H = 72 kJ mol^–1E_a = 77 kJ mol^–1

E_a for the bimolecular recombination of two OH radicals to form H₂O and O is :

• A. 149 kJ mol^–1
• B. – 149 kJ mol^–1
• C. 5 kJ mol^–1
• D. – 5 kJ mol^–1

Answer 1

Answer: (C)

5 kJ mol^–1

Answer 2

X(H₂O₂ $\longrightarrow$H₂O + O) = 77 – 72 = 5 kJ