anonymous
  • anonymous
if the concentration of reactants are expressed in mol/L and time is expressed in seconds, what are the units for the rate constant K?
Chemistry
chestercat
  • chestercat
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anonymous
  • anonymous
What is the equation for the rate constant?
anonymous
  • anonymous
rate = k[a][b]
anonymous
  • anonymous
with t on the end

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anonymous
  • anonymous
We want to rate to have units of (mole/L)*s right?
anonymous
  • anonymous
Sorry, we want units of mole/L-s
anonymous
  • anonymous
Therefore, the rate constant must have units of \(1/s\)
Xishem
  • Xishem
Assuming the two reactants have reaction orders of 1, the rate constant needs to have units of: \[\frac{M}{s}=k*M*M\]\[\frac{M}{s}=\frac{1}{M*s}*M*M\]\[\frac{M}{s}=\frac{M}{s}\]Therefore, the rate constant must have units of: \[M^{-1}s^{-1}\]
Xishem
  • Xishem
Or, alternatively \[LĀ·mol^{-1}s^{-1}\]

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