The reaction $A + B P$ is first order in each reactant. With $[B]_{0} = 0.50 mol L^{- 1}$ in large excess over $A$ , the observed first order rate constant for the disappearance of $A$ is $3.45 \times 1 0^{- 3} mi n^{- 1}$ . Find the second order rate constant $k$ in units of $1 0^{- 3} L mo l^{- 1} mi n^{- 1}$ (two decimals).

Numerical answer type, answer in 10^-3 L mol^-1 min^-1, tolerance 0.02.

Answer: 6.9 10^-3 L mol^-1 min^-1

With

B

in excess,

k_{o b s} = k [B]_{0}

. So

k = 3.45 \times 1 0^{- 3} /0.50 = 6.90 \times 1 0^{- 3} L mo l^{- 1} mi n^{- 1}