According to the description,
when T1=500 K, k1=1.4x10^-2 M-1 S-1.
Now since k=Ae^(-Ea/RT)
when T2=333 K, Ea=80. kJ/mol=80x10^3 J/mol
=1.4x10^-2xe^(80x10^3/ 8.314x500 - 80x10^3/ 8.314x333)
=9.02x10^-7 M-1 S-1
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