Consider the following equilibria at 300 K

$\begin{array}{l}2A\left(g\right)+{\mathrm{H}}_2\mathrm{O}\left(g\right)\rightleftharpoons C\left(g\right)+3D\left(g\right)\\ K_P=3\times {10}^{22}\mathrm{atm}\end{array}$

The equilibrium was attained in a container by taking A, C and D at partial pressures of 2 atm each along with large amount of liquid water. If vapour pressure of water at 300 K is 38 mm of Hg then calculate partial pressure of A when equilibrium gets established. [Express your answer in terms of $\left.{10}^{-10}\mathrm{atm}\right]$