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## Homework Statement

Consider a simple, physical model of a cell in which the cell is regarded as a spherical bag with radius r, bounded by a membrane permeable to alcohol with permeability, P=20μms

^{-1}. Show the concentration of alcohol in the cell is governed by this equation.

## Homework Equations

-d(Δc)/dt = (3P/r)Δc

## The Attempt at a Solution

I don't really know what to do with this, I don't really know where to start. The second bit of the question asks to solve the equation which I guess you can do by bringing dt over to the other side and dividing by Δc and integrating both sides, but I have no idea how to get the equation really.