$(30$ pnts$)$ Gas $x$ diffuses at steady state through a tube containing helium. At point $1$ the partial pressure of $x$ is $p_{A1}=45$kPa and at point $20\mathrm{.}05m$ apart $P_{A2}=5$KPa. The total pressure is $101\mathrm{.}32$kPa, and the temperature is $298K.$ At this pressure and temperature, the value of diffusivity is $3\mathrm{.}75**{10}^{-5}\frac{m^2}{sec}.$ Assuming steady state for equimolar counter diffusion, calculate the partial pressure of $x$ at a point $0\mathrm{.}02m$ apart from point $1.$

$(R=8\mathrm{.}314\frac{J}{m}$olK$)$