Methane is injected into a 5-meter pipe with an outer diameter of 20mm and a wall thickness of 1mm. Pipe is prefilled with Nitrogen. Process conditions are 27 oC and pressure 1 Atm. Molar volume: CH4 = 28.958 dm3/mol. Molar volume: N2 = 22.393 dm3/mol.1.DETERMINE Diffusion coefficient for CH4 N2 mixture2.determine the mass diffusion rate of methane in nitrogen.

**please provide mathematical step by step calculation with exact answer .not only the step how to solve it.