Question: How to plot this function including numeric values in Maple

I am currently studing mass transfer (chemical engineering major), there is an equation that we need to plot to solve the problem. The equation is attached below.

When I use maple to plot this equation, it always come up "Warning, unable to evaluate the function to numeric values in the region; see the plotting command's help page to ensure the calling sequence is correct". Does anyone know how to plot this equation? Thank you very much for your help.

 

PS: I need to plot this equation (eq) with respect to R on the graph.

Please Wait...