Problem: Based on the phase diagram for methane below, what happens to methane as it is heated from −250 oC to 0 oC at a pressure of 10-2 atm?

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Tracing the phase diagram:

Heating methane at a constant pressure of 10-2 atm from -250°C to 0 °C results in

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Problem Details

Based on the phase diagram for methane below, what happens to methane as it is heated from −250 oC to 0 oC at a pressure of 10-2 atm?

Phase diagram of methane. The x axis temperature in degrees C ranging from -200 to 100 with intervals of 100. The y axis is pressure in atmospheres ranging from 10 to the -4 to 10 to the 3 in log scale. 1-Point that is the intersection of the sublimation, melting, and vapor-pressure curves. -180 degrees C and 10 to the -1 atmospheres. 2-A point in the gas phase at 0 degrees C and 1 atmosphere. 3-Point at the upper end of the vapor-pressure curve. -80 degrees C and 50 atmospheres Sublimation curve. Curve slanting right from negative 220 degrees C and 10 to the -4 atmospheres to point 1. Melting curve. Curve rising nearly vertically and then slanting right from point 1 to the top of the y-axis near 0 degrees C. Vapor-pressure curve. Curve from point 1 to point 3. Solid. Left of melting curve and sublimation curve. Liquid. Above point 1, left of point 3, and between the melting and vapor–pressure curves. Gas. Right of the sublimation and vapor pressure curves


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