The molar composition of a gas is $10\%$ H$2,10\%$ O$2,30\%$ CO$2$ and balance H$2$O$.$ If $50\%$ H$2$O condenses, the final mole percent of H$2$ in the gas on a dry basis will be

$10\%$

$5\%$

$18\mathrm{.}18\%$

$20\%$