5) a) Calculate the mean free path (l) for argon gas at a temperature of 20C and a pressure of 1.00 bar. (d = 3.841010 m; R = 8.3145 J mol-1 K -one , = 3.14) b) At 25C, the volume of 1 mole of ideal gas is isothermally 2 dm3 from 20 dm3 It expands to . U, H, Calculate S, A and G. (R=8.3145 J mol-1 K -one )