The following chemical reaction: A → products shows second order kinetics with respect to A; rate = k[A]² .Assume k = 12.77 x 10⁻⁴ mol⁻¹ L s⁻¹ .

If the initial concentration of A is 0.83 mol L⁻¹, what is the concentration of A (in mol L⁻¹) after 2.72 minutes?