kinetics2ndpart

# kinetics2ndpart - So for the equation N 2 O 5(g> 2NO 2(g...

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Temperature--Arrhenius Equation Relates rate constant, k, to T: A = factor to account for steric effects k = rate constant (R,T are old friends) taking (ln) of both sides: k = Ae ! E a RT ln k = ln A - E a R ! T = ln A - E a R " # \$ % & 1 T " # \$ % &

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Temperature--Arrhenius Equation ln k = ln A - E a R ! T = ln A - E a R " # \$ % & 1 T " # \$ % & So let’s plot ln k vs. 1/T Slope should be -E a /R and intercept should be ln A Let’s see what this looks like with an example:
Temperature--Arrhenius Equation ln k = ln A - E a R ! T = ln A - E a R " # \$ % & 1 T " # \$ % & So let’s plot ln k vs. 1/T Slope should be -E a /R and intercept should be

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Unformatted text preview: So for the equation: N 2 O 5 (g) -> 2NO 2 (g) + 1/2 O 2 (g) Now let’s plot these data! Temperature k, s-1 lnk 1/T 298 3.46E-05 -10.2716569 0.0033557 328 1.50E-03 -6.50229017 0.00304878 358 3.34E-02 -3.39919938 0.0027933 378 2.10E-01 -1.56064775 0.0026455 Determining E a from data (another way) • Can use two different k’s and associated T’s: • Better way is to graph ALL the data (as we just did), but this method is a reasonable estimate! ln k 2 k 1 = E a R 1 T 1- 1 T 2 ! " # \$ % &...
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