2. Adsorption of N2 gas onto the surface of a powder is measured at 75 K. (Adsorption measurements must be made at such low temperatures because above 127 K, the critical temperature of liquid nitrogen, there is no saturation pressure.) At 75 K, the saturation pressure (Po, the pressure at which N2 liquifies) is 570 mmHg. Below is a table of N2 pressures applied and volumes of N2 absorbed to the powder. P (mmHg) 1.17 Vp (cm) 300 360 411 14.0 45.8 87.5 128 468 523 164 573 627 205 a) In Excel, plot Vply-axis) versus p (x-axis). Is the relationship linear? pl Po b) In Excel, now plot vs. (p/Po). Is this relationship linear? V (1-p/po) c) Calculate the values of the B.E.T. parameters Vm and b from this graph