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+//Example 5.7//
+D=(-1.0*10^-8);//m^2/s //constant diffusion coefficient
+ch=1.5;//kg/m^3 //constant surface concentrationsof the diffusing species
+ct=0.3;//kg/m^3 //constant surface concentrationsof the diffusing species
+x=5*10^-3;//m //meter //solid of thickness
+y=(-D)*(((ch-ct)/(x)))
+//mprintf("y = %e kg/m^2 h",y)
+t=3.6*10^3;//s/h //time
+J=y*t
+mprintf("J = %e kg/m^2.h",J)
+//The total mass of hydrogen being purified will then be this flux times the membrane area
+A=0.2;//m^2 //membrane area
+m=J*A
+mprintf("\nm = %e kg/h",m)