The rate of a third order reaction
      A + B + C P + Q
      is 4.2 × 10−2 mol L−1 s−1
      when the concentrations of A, B and C are 0.25, 0.10 and 0.05 mol L−1 respectively.

      Calculate the value of the third order rate constant.
      ν = k[A][B][C]

       
      Thus by using the rules of algebra it is seen that
      the units of this third order reaction are L2 mol−2 s−1.