Problem: Naphthalene, (C10H8) is the main ingredient in traditional mothballs. Its normal melting point is 81˚C, its normal boiling point is 218˚C, and its triple point is 80˚C at 1000 Pa.Using the data, construct a phase diagram for naphthalene, labeling all the regions.

🤓 Based on our data, we think this question is relevant for Professor Kammerdiener's class at KSU.

FREE Expert Solution

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

• Liquid: can be found between the solid and gas regions

• Gas: can be found at low pressure and high temperature


  • normal melting point is the temperature at which a solid changes into a liquid at 1 atm (101.325 kPa)
    •  point wherein line between the solid and liquid phase meets
  • normal boiling point is the temperature at which a liquid changes into a gas at 1 atm ((101.325 kPa)
    •  point wherein line between the liquid and gas phase meets
  • triple point - all three phases are in equilibrium (S, L, G lines meet)
    • 1000 Pa = 1 kPa
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Problem Details

Naphthalene, (C10H8) is the main ingredient in traditional mothballs. Its normal melting point is 81˚C, its normal boiling point is 218˚C, and its triple point is 80˚C at 1000 Pa.

Using the data, construct a phase diagram for naphthalene, labeling all the regions.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Phase Diagram concept. You can view video lessons to learn Phase Diagram. Or if you need more Phase Diagram practice, you can also practice Phase Diagram practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Kammerdiener's class at KSU.