7°C, the rate constant is 4.90 × 10-4 min-1. At 39°C, the rate constant is 0.00139 min-1. By what factor does the rate of uncoiling increase (per °C) over this temperature interval?
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Pt. A The uncoiling of deoxyribonucleic acid (DNA) is a first-order reaction. Its activation energy is 420 kJ. And at 37°C, the rate constant is 4.90 × 10-4 min-1. At 39°C, the rate constant is 0.00139 min-1. By what factor does the rate of uncoiling increase (per °C) over this temperature interval? __________ times/°C rise |
Pt B. The gas phase reaction
2 N2O5(g) → 4 NO2(g) + O2(g)
has an activation energy of 103 kJ/mol, and the first order rate constant is
3.62×10-8 min-1 at 236 K. What is the rate constant at 286 K?
___________ min-1
Part C. When heated, cyclopropane is converted to propene. Rate constants for this reaction at 470. °C and 510. °C are k1 = 1.10 × 10-4 s-1 and k2 = 1.02 × 10-3 s-1, respectively. Determine the activation energy, Ea, from these data.
Ea = ________________ kJ/mol
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