1. K

    Equation for chemical potential of pure substance. Unsure why this derives as it does

    Hello, I am new to this. I have attached a screenshot from a journal article which talks about deriving Fick's first law. My calculus is a little rusty, and I don't understand how equation 5 is derived from equation 4. I'd have a go, but I have little to offer. All I have to offer is...