Please help me with question 37. Thank you in advance **Phase Diagrams and Crystal Structures****Question 35:**The phase diagram for a pure substance is provided below. What is the critical pressure?**Diagram Description:**The graph is a phase diagram displaying the states of matter (solid, liquid, vapor) for a substance based on different pressures and temperatures. The y-axis represents Pressure (in atm), ranging from 0 to 300 atm. The x-axis represents Temperature (in Kelvin), ranging from 0 to 400 K.- The line separating the solid and liquid phases slopes upwards from left to right.- The line separating the liquid and vapor phases also slopes upwards but is more vertical.- The line separating the solid and vapor phases is relatively flatter compared to the others. **Answer Choices:**a. 150 atm b. any pressure above 325 atm c. 50 atm d. 325 atm e. 200 atm **Question 36:**The phase diagram for a pure substance is provided below. At 1 atm and 150 K, the substance exists as:**Diagram Description:**Similar to the previous phase diagram, this graph represents the states of matter based on varying pressures and temperatures, with the same range for pressure (0 to 300 atm) and temperature (0 to 400 K).- The solid, liquid, and vapor regions are clearly demarcated. **Answer Choices:**a. both vapor and liquid in equilibrium b. liquid c. solid d. both vapor and solid in equilibrium e. vapor **Question 37:**A cubic close-packed structure has a:**Answer Choices:**a. ABCABC…pattern of layers and a coordination number of 12 b. ABABAB… pattern of layers and a coordination number of 12 c. ABCDABCD… pattern of layers and a coordination number of 4 d. ABBA… pattern of layers and a coordination number of 8 e. AABB… pattern of layers and a coordination number of 8

37. In the unit cell of cubic close packed structure there will be four layers of atoms. The top and bottom layers contain six atoms at the corners of a hexagon and one atom at the centre of each hexagon. The atoms in the second later will fit into the depressions in the first layer. The atoms in the third layer occupy entirely different set of depressions.The arrangement of cubic close packed structure is shown below: ABC-ABC type of arrangement.Atoms in cubic close packing have coordination number of 12. In a layer there are six atoms+ three atoms in a top layer + three atoms in the bottom layer.Answer: option a) Cubic close packed structure has ABCABC type layers and with a coordination number 12.