Chemistry Practice Problems Phase Diagram Practice Problems Solution: Use the phase diagram for neon to answer the follo...

Solution: Use the phase diagram for neon to answer the following questions:What is the approximate value of the normal melting point?

Problem

Use the phase diagram for neon to answer the following questions:

A phase diagram for neon. The x-axis is temperature in Kelvin, ranging from 0 to 100 with intervals of 20. The y axis is pressure in atmospheres, ranging from 10 to the negative thee to 10 to the positive three. The line separating the solid and gas starts at (15, 10^-3), runs through (18, 10^-2), (22, 10^-1), and ends at (24, 0.4). The line separating the solid and liquid is vertical starting at (24, 0.4) running through (24, 10^3). The curve separating the gas and liquid starts at (24, 0.4) and runs through (36, 10), ending at (44, 27). There is a vertical line separating the liquid and supercritical fluid starting at (44, 27) and running through (44, 10^3). There is a horizontal line separating the gas from the supercritical fluid starting at (44, 27) and running through (100, 27).

What is the approximate value of the normal melting point?

Solution
  • Melting point of a substance is the temperature where solid changes to liquid. At melting point, solid and liquid exists in equilibrium
  • When it says at normal boiling pointthis is the temperature when the change of solid to liquid happens at 1 atm.
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