An autoclave (pressure/vacuum vessel) contains pure N2 molecules with a collision diameter of 370 picometer (pm) (take collision cross section: 0.43 nm2 ) at 1 bar pressure and 25 C. Calculate (a) the mean speed of the molecules (m/s), (b) the mean free path (m) and (c) the collision frequency (s-1 ). Recalculate (a, b and c) when the pressure is 1.1x10-8 bar. N2: 28.02 g/mol, Boltzman constant: 1.3806 1023 1