Actually this problem is now looking to be an easy one
In a tyre of "Ferrari" car of Mr. Obama, a tube having a volume of 12.3 litres is filled with air at a pressure of 4 atm at 300 K. Due to travelling, the temperature of the tube and air inside it raised to 360 K and pressure reduced to 3.6 atm in 20 minutes. If the porosity (number of pores per unit area) of the tube material is 5 x 105 pores/cm2 and each pore can transfer air from inside to outside of the tube with the constant rate of 6.023 x 108 molecules per minute. Calculate the total surface area of the tube. (Give your answer as total surface area (m2) Ã— 10â€“3. (R = 0.082 Lt  atm / mole  K)).

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