A gas mixture containing $9\mathrm{.}1\%$ NH$3,89\mathrm{.}1\%$ N$2$ and $1\mathrm{.}8\%$ H$2$O

vapor by mole flows at a rate of $1\mathrm{.}2$ kg$/$s through a pipe of $0\mathrm{.}5$ m

diameter. The gas has a total pressure of $1\mathrm{.}2$ atm and a

temperature $25$ oC$.$

Calculate the average velocity of the gas in the pipe in m$/$s$.$

Given molecular weight of elements: NH$3=17,$ N$2=28,$ H$2$O $=$

$18.$