Below is a phase diagram for compound X. You wish to purify a sample of X that was collected at P = 1.0 atm and T = 100 by subliming it. In order to sublime the sample, you should

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By looking at the phase diagram, we can see that sublimation occurs at pressures below the triple point and temperatures above the sublimation curve (solid-vapor equilibrium). Option A would raise the temperature to above the sublimation curve, but keep the pressure at 1.0 atm, which would not allow sublimation to occur. Option B would abandon the attempt altogether. Option D would increase the pressure to above the triple point, which would cause X to undergo a different phase change (not sublimation). Option E would raise the temperature to above the sublimation curve, but then lower the pressure below the triple point, which would also not allow sublimation to occur. Option C, however, would lower the pressure to below the triple point and then raise the temperature to above the sublimation curve, allowing for sublimation to occur.

Below Is a Phase Diagram for Compound X