A flat tissue engineered skin (thickness 2.9 mm) is attached to the bottom of a dish and cultured with cell media atop it (which has an oxygen concentration of 0.15 mol/m ³ ). The diffusivity of oxygen in the skin is 3.0 E-9 m ² /s, and according to experiments that you’ve performed, you want to make sure that the concentration of oxygen in the device doesn’t fall below 0.060 mol/m ³ . (Below that concentration harms the cells.)

The rate of oxygen consumption is -4.3 E-17 mol/[cell◦s]. What is the maximum cellularity (in cells/mL, three significant digits) that this tissue engineered skin can support?