Chemical Kinetics

For an elementary reaction

\(2 \mathrm{~A}+\mathrm{B} \longrightarrow 3 \mathrm{C}\)

rate of appearance of \(\mathrm{C}\) is \(1.3 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}\), the rate of disappearance of \(\mathrm{A}\) is: