Canceling out the constants and taking the natural log of both sides gives us this:
Ea1/T1=Ea2/T2
Ea1=75kJ
T1=298K
Ea2=49kJ
T2=?
So now,
T2= Ea*T1/Ea = 75*298/49
Your answer should be 456.12 = 456K!
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