# How do I relate equilibrium constants to temperature change to find the enthalpy of reaction?

(I moved this into Energy Change in Reactions since the varying

There's a useful equation we can use.

and its variation:

where

You may also have seen another variation with kinetics:

which is very similar, and just contains the rate constants

You can use both values of

You should have seen something like this plot before, which is represented by the above first or second equation (

This is derived from the Van't Hoff Equation,

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Use the Van 't Hoff equation: ΔH = ΔS * T. Rearrange it as ln(K2/K1) = (ΔH/R) * (1/T1 - 1/T2), where K is the equilibrium constant, T is temperature in Kelvin, ΔH is the enthalpy change, ΔS is the entropy change, R is the gas constant.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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