We’re being asked to determine the normal boiling point of a given substance base on its phase diagram.
Recall that a phase diagram shows the transition of matter between solid, liquid, and gas phases as temperature and pressure changes.
In a phase diagram, the different phases can be identified by their location:
• Solid: can be found at high pressure and low temperature; labeled A in the phase diagram
• Liquid: can be found between the solid and gas regions; labeled B
• Gas: can be found at low pressure and high temperature; labeled C
The phase diagram of a hypothetical substance is shown below.
Estimate the normal boiling point of the substance.
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