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(c) Is methane a solid, liquid, or gas at 1 atm and 0 °C? (d) If solid methane at 1 atm is heated while the pressure is held constant, will it melt or sublime? (e) If methane at 1 atm and 0 °C is compressed until a phase change occurs, in which state is the methane when the compression is complete?

(c) Is methane a solid, liquid, or gas at 1 atm and 0 °C? (d) If solid methane at 1 atm is heated while the pressure is held constant, will it melt or sublime? (e) If methane at 1 atm and 0 °C is compressed until a phase change occurs, in which state is the methane when the compression is complete?

Chemistry
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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(c) Is methane a solid, liquid, or gas at 1 atm and 0 °C?

(d) If solid methane at 1 atm is heated while the pressure is held constant, will it melt or sublime?

(e) If methane at 1 atm and 0 °C is compressed until a phase change occurs, in which state is the methane when the compression is complete?

**28. Consider the phase diagram of Methane:** The phase diagram of methane is a graphical representation outlining the conditions of pressure and temperature under which methane exists in different states: solid, liquid, gas, and supercritical fluid. - **Axes:** - The x-axis represents temperature in degrees Celsius (°C), ranging from approximately -220°C to 100°C. - The y-axis represents pressure in atmospheres (atm), spanning from 10^-4 atm to 10^2 atm in a logarithmic scale. - **Phases:** - The **solid phase** is found at low temperatures and high pressures, shown in the lower-left region of the diagram. - The **liquid phase** is present at higher pressures and a moderate range of temperatures, indicated by the upper-middle blue region. - The **gas phase** occupies the right side of the diagram, with higher temperatures and low pressures. - The **supercritical fluid** region is located at high temperatures and pressures above the critical point. - **Lines:** - The lines separating solid, liquid, and gas phases are known as phase boundaries. - The line between the liquid and gas phases ends at the critical point, beyond which the substance becomes a supercritical fluid. - The triple point, where all three phases coexist, is marked where the solid, liquid, and gas phase boundaries intersect. This diagram provides critical insights into the thermodynamic behavior of methane, useful for practical applications involving temperature and pressure variations.
Transcribed Image Text:**28. Consider the phase diagram of Methane:** The phase diagram of methane is a graphical representation outlining the conditions of pressure and temperature under which methane exists in different states: solid, liquid, gas, and supercritical fluid. - **Axes:** - The x-axis represents temperature in degrees Celsius (°C), ranging from approximately -220°C to 100°C. - The y-axis represents pressure in atmospheres (atm), spanning from 10^-4 atm to 10^2 atm in a logarithmic scale. - **Phases:** - The **solid phase** is found at low temperatures and high pressures, shown in the lower-left region of the diagram. - The **liquid phase** is present at higher pressures and a moderate range of temperatures, indicated by the upper-middle blue region. - The **gas phase** occupies the right side of the diagram, with higher temperatures and low pressures. - The **supercritical fluid** region is located at high temperatures and pressures above the critical point. - **Lines:** - The lines separating solid, liquid, and gas phases are known as phase boundaries. - The line between the liquid and gas phases ends at the critical point, beyond which the substance becomes a supercritical fluid. - The triple point, where all three phases coexist, is marked where the solid, liquid, and gas phase boundaries intersect. This diagram provides critical insights into the thermodynamic behavior of methane, useful for practical applications involving temperature and pressure variations.
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