Question

Pre exponential factor for free radical combination of chlorine is 2 × 10¹³ sec^–1. the rate constant (in hr^–1) of this reaction at STP –

• A. 7.2 × 10¹⁶hr^–1
• B. 3.6 × 10¹⁶hr^–1
• C. 14.4 × 10¹⁶hr^–1
• D. 7.2 × 10¹⁵hr^–1

Answer 1

Answer: (A)

7.2 × 10¹⁶hr^–1

Answer 2

For free radical combination reaction E_a = 0

K = Ae^–Ea/RT ̃ Putting E_a = 0

K = 2 × 10¹³ sec^–1

K = 2 × 10¹³ × 3600 hr^–1

K = 7.2 × 10¹⁶ hr^–1