Please help me with questions 33 & 34. Thank you in advance 33. The phase diagram for a pure substance is given below.300250Liquid200Pressure,150 +atmSolid100+Vapor50100200300400Temperature, KThe substance is stored in a container at 150 atm at 25°C. Describe what happens if thecontainer is opened at 25°C.a. The liquid in the container vaporizesb. The solid in the container sublimesc. The liquid in the container freezesd. The solid in the container meltse. The vapor in the container escapes34. The following unit cell is thea. body-centered cubic unit cellb. face-centered cubic unit cellc. cubic close-packed unit celld. hexagonally close-packed unit celle. coordination number 4 unit cell

The substance is stored in the container at 150atm pressure and 25°C ( 298K ) temperature. By comparing these coordinates in the phase diagram given, we can observe that the substance is in liquid state. Now when the container opens out then all the pressure in the container is lost and it will come to the atmospheric pressure at some time. As the temperature is of room temperature there is no change for it. So, now we compare the coordinates of 1atm pressure with 298K temperature. These corresponds to vapor phase in the phase diagram. So, the substance changes from liquid to vapor phase. Therefore, option a.As the cell is cubic in shape and all the corners of the unit cell is occupied by the atoms and one atom is present in the center of the unit cell it corresponds to Body centered cubic cell shape. Option a.