5. The rate constant for a reaction increases from 10.0 s⁻¹ to 100. s⁻¹ when the temperature is increased from 315K to 416K. What is the activation energy for the reaction in kJ/mol? (R = 8.314 J/mol·K) (A) 10.8 kJ/mol (B) 0.0823 kJ/mol (C) 1.90 kJ/mol (D) 19.3 kJ/mol (E) 24.8 kJ/mol

7. The elementary chemical reaction O + ClO → Cl + O2 is made pseudo-first order in oxygen atoms by using a large excess of ClO radicals. The rate constant for the reaction is 3.5 × 10⁻¹¹ cm³/molecule·s. If the initial concentration of ClO is 1.0 × 10¹¹ molecules/cm³, how long will it take for the oxygen atoms to decrease to 10.% of their initial concentration? (A) 3.2 × 10⁻³ s (B) 0.66 s (C) 0.017 s (D) 23 s (E) 2.4 s

5. The rate constant for a reaction increases from 10.0 s⁻¹ to 100. s⁻¹ when the temperature is increased from 315K to 416K. What is the activation energy for the reaction in kJ/mol? (R = 8.314 J/mol·K)
(A) 10.8 kJ/mol
(B) 0.0823 kJ/mol
(C) 1.90 kJ/mol
(D) 19.3 kJ/mol
(E) 24.8 kJ/mol

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