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
L^{2} mol^{−2} s^{−1}.