Question

19. You are given the following data for a new substance, Redlandium. Phase Change Data for Redlandium Normal Melting Point 57.3 °c 127.5C 224.0 C 2.5 atm Normal Boiling Point Critical Temperature Critical Pressure O. The triple point is 80.0 °C and 0.6 atm. The sublimation line will pass through the origin. The melting point line will pass through the point 75.0 °C and 2.6 atm. The boiling point line will pass through the point 200.0 °C and 1.75 atm. On a SEPARATE SHEET OF GRAPH PAPER, sketch a phase diagram for Redlandium. Label the axes, solid, liquid and gas phases, critical point, triple point and the normal boiling and melting points. (3 points) (Be sure to use an entire sheet of graph paper)

Answer 1

First calculate mole of gas moles gas = PV/RT = (1.02 atm) (1.38 L)/(0.0825 L atm/mol k) (273 + 33.8) = 1.41 moles The New pressure of the gas would be, P = n RT/V = (.41 moles) (0.08205 L atm/mol k) (273 .44.3)/(0.72 L) = 51 atm