5. A sample of N2 gas at 298 K and 1 atm. The diameter of N2molecule is d = 3.6 × 10-10 m. (1) Calculate the collisions persecond that one molecule of N2 make. (II) Calculate the mean freepath 2 in meter. 6. An ideal gas has absorbed 900 J as a heatenergy and the volume of the gas was decreased from 20 L to 10 L atconstant external pressure of 5 atm. (1) The work done on thesystem (in J) in this process is: (II) The internal energy change(AU) of the system (in J) in this process is: 7. A cylinder with apiston contained 5 mole of helium (He). The system allowed toexpand at constant pressure after adsorbing 25 kJ energy as a heat.(Knowing that Cy =12.47 J/mol.K) (1) Calculate AH (in J) for theprocess? (II) Calculate AU (in kJ) for the process?
