# Problem: The rate law for a reaction is rate = k[A]2[B]2. The units of the rate constant when the concentrations are measured in mol/L and the time in seconds areA. M-3 s-2B. M-1 s-1C. M-2 s-1D. M-3 s-1E. M-1 s-3

###### FREE Expert Solution

We’re being asked to determine the units of the rate constant when the concentrations are measured in mol/L and the time in seconds. Were given the rate law for a reaction:

rate = k[A]2[B]2

We can determine the unit of the rate constant from its rate lawRecall that the rate law only focuses on the reactant concentrations and has a general form of:

k = rate constant
A & B = reactants
x & y = reactant orders

To determine the unit of the rate constant, we will use the following equation:

###### Problem Details

The rate law for a reaction is rate = k[A]2[B]2. The units of the rate constant when the concentrations are measured in mol/L and the time in seconds are

A. M-3 s-2
B. M-1 s-1
C. M-2 s-1
D. M-3 s-1
E. M-1 s-3