Question: Help on this plot

I am currently doing a project for mass transfer class. Here is a differential equation that I need to solve:

For the solution, and plug in the value of C_AS and C_A0, I finally got the concentration profile of:

Then I write the commands and Maple won't give me a plot (no warnings appeared). Can someone help me with this situation?

Thank you very much!

You might need to download the image to see the full equation. Sorry for the inconvenience.

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