problem 1 ()mework # ! Problem l Hydrogen can be separated from natural gas by d

Question

problem 1

()mework # ! Problem l Hydrogen can be separated from natural gas by diffusion through the porous cylindrical wall of a round tube. The rate of separation is given by where N - rate of transport of H, through the tube wall, in moles's. D = diffusion coefficient of hydrogen gas through the pores. p= molar density of H., in moles/cm3 L-length of tube, in cm. r, , r inner and outer radius of the cylindrical wall, respectively What are the units of D? Problem 2 State what would you plot to get a straight line if experimental (x.y) data are to be correlated the following relations, and what the slopes and intercepts will be in terms of the relati parameters. If you could use two different kinds of plots (e.g.,rectangular or semilog) state w you would plot in each case. The solution to part (a) is given as an example. (a) aei s laty e 1/% in rectangular coordin

Explanation / Answer

Answer to your problem 1 is:

the basic concept behind finding the units is that just like you equate right hand side of equation to its left hand side, do the same for units.

since ln(r2/r1) is dimensionless.

2pie is also dimensionless.

So, let the units of D be a;

equating the units,

(moles/s)=(moles/cm3)*(cm)*(a);

therefore a=cm2/s

Therefore units of D are cm2/s.

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