$($Barbir Chp$4$ Problem $4)$ Calculate:

a$.$ Permeability of hydrogen at $60C.($Answer: $3\mathrm{.}66{10}^{-16}mo\frac{l}{c}$msPa $)$

b$.$ What would be the permeation rate through $200c{m}^2$ of Nafion $115$ membrane $($thickness $=0\mathrm{.}0127cm)$ if the pressure of hydrogen is $300$ kPa $?($Answer: $1\mathrm{.}73{10}^{-6}mo\frac{l}{s})$

c$.$ What would be the equivalent current loss? $($Answer: $1\mathrm{.}67m\frac{A}{c}{m}^2)$