A rectangular tank is split in the middle with a nonpermeable wood block 6.2 cm thick that separates dry air (21% oxygen and 79% nitrogen, left) and modified air containing 67.1% oxygen, the rest is nitrogen (right). A cylindrical horizontal hole with diameter 2.8 cm is present in the wood block but is currently covered by a plate. If the cover plate is suddenly removed, at what rate is oxygen gas diffusing from right to left? The system temperature is held constant at 38.1C and the overall pressure is 1 atm. 1.35 g/h 2.30 g/h C 7.20 g/h 1.80 g/h C 3.19 g/h