## anonymous 4 years ago 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?

1. anonymous

What is the equation for the rate constant?

2. anonymous

rate = k[a][b]

3. anonymous

with t on the end

4. anonymous

We want to rate to have units of (mole/L)*s right?

5. anonymous

Sorry, we want units of mole/L-s

6. anonymous

Therefore, the rate constant must have units of $$1/s$$

7. 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: $M^{-1}s^{-1}$

8. Xishem

Or, alternatively $L·mol^{-1}s^{-1}$