If  $O_2$ gas is bubbled through water at 303 K, the number of millimoles of $O_2$  gas that dissolve in 1 litre of water is ______. (Nearest integer)
(Given : Henry’s Law constant for $O_2$ at 303 K is 46.82 k bar and partial pressure of $O_2$ = 0.920 bar)
(Assume solubility of $O_2$ in water is too small, nearly negligible)