K1 = 0.727

K2 = 12.1
T1 = 2000
T2 = 3000

Solve for the standard enthalpy of formation.

They gave me the formula ln(K2/K1) = DeltaH /R (T2 - T1 / T1T2)

The answer is supposed to be in KJ/mol and I keep getting 2.022 but its not right. I'm not sure what Im doing wrong

Why not show your work and let us find the error? That's the easy way for us. Is 2000 and 3000 in C or K? Are you using 8.314 for R?