Given: 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 °C and pressure 1 Atm.

Molar volume: CH₂ = 28.958 dm³/mol.

Molar volume: N₂ = 22.393 dm³/mol.

To find:

1. Diffusion coefficient for CH₂-N₂ mixture

2. Mass diffusion rate of Methane (CH4) in Nitrogen (N₂)