The gas-phase reaction of NO with F2 to form NOF and F has an activation energy of Ea = 6.30 kJ/mol and a frequency factor of A = 6.00×108 M−1⋅s−1 . The reaction is believed to be bimolecular: NO(g)+F2(g)→NOF(g)+F(g) where NO is a free radical. Free radicals, species with an odd number of unbound electrons, tend to be more reactive. This is one reason by NO reacts so readily with gases such as fluorine or oxygen gas. Part A What is the rate constant at 573 ∘C ? Express your answer to three significant figures. View Available Hint(s)for Part A

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