The reaction: $\mathrm{A}\left(g\right)⟶2\mathrm{B}\left(g\right)+\mathrm{C}\left(g\right)$ is a first order reaction w.r.t.  A, with rate constant $1.386\times {10}^{-4} {\sec }^{-1}$ . If initially 0.1 mole/litre of A was taken and the reaction is occurring at constant pressure and temperature then the concentration of A after 5000 sec will b