CBSE (Science) Class 11CBSE
Share

# 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

ConceptChange of State - Latent Heat Capacity

#### 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.

Is there an error in this question or solution?

#### 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.
S