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Answer the Following Questions Based on The P–T Phase Diagram of Co2: Describe Qualitatively the Changes in a Given Mass of Solid Co2 at 10 Atm Pressure and Temperature –65 °C as It is Heated up to Room Temperature at Constant Pressure. - CBSE (Science) Class 11 - Physics

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Question

Answer the following questions based on the P–T phase diagram of CO2:

Describe qualitatively the changes in a given mass of solid CO2 at 10 atm pressure and temperature –65 °C as it is heated up to room temperature at constant pressure.

Solution 1

When the solid CO2 at – 65 °C is heated at 10 atm pressure, it is first converted into liquid. A further increase in its temperature brings it into the vapour phase. If a horizontal line at P = 10 atm is drawn parallel to the T-axis, then the points of intersection of line with the fusion and vaporization curve give the fusion and boiling points at 10 atm.

Solution 2

The fusion and boiling points are given by the intersection point where this parallel line cuts the fusion and vaporisation curves.

Explanation

When the temperature of a mass of solid CO2 (at 10 atm pressure and at –65°C) is increased, it changes to the liquid phase and then to the vaporous phase. It forms a line parallel to the temperature axis at 10 atm. The fusion and boiling points are given by the intersection point where this parallel line cuts the fusion and vaporisation curves.

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APPEARS IN

 NCERT Solution for Physics Textbook for Class 11 (2018 to Current)
Chapter 11: Thermal Properties of Matter
Q: 17.3 | Page no. 296
Solution Answer the Following Questions Based on The P–T Phase Diagram of Co2: Describe Qualitatively the Changes in a Given Mass of Solid Co2 at 10 Atm Pressure and Temperature –65 °C as It is Heated up to Room Temperature at Constant Pressure. Concept: Change of State - Latent Heat Capacity.
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