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Co2 at 1 Atm Pressure and Temperature – 60 °C is Compressed Isothermally. Does It Go Through a Liquid Phase? - CBSE (Science) Class 11 - Physics

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Question

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

CO2 at 1 atm pressure and temperature – 60 °C is compressed isothermally. Does it go through a liquid phase?

Solution 1

No

 The P-phase diagram for COis shown in the following figure.

At 1 atm pressure and at –60°C, CO2 lies to the left of –56.6°C (triple point C). Hence, it lies in the region of vaporous and solid phases.

Thus, CO2 condenses into the solid state directly, without going through the liquid state

Solution 2

No, the CO2 does not go through the liquid phase. The point (1.00 atm, – 60°C) is to the lift of the triple-point O and below the sublimation curve OA. Therefore, when CO2 is compressed at this point at constant temperature, the point moves perpendicular to the temperature-axis and enters the solid phase region. Hence, the COvapour condenses to solid directly without going through the liquid phase.

  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: 17.1 | Page no. 296
Solution Co2 at 1 Atm Pressure and Temperature – 60 °C is Compressed Isothermally. Does It Go Through a Liquid Phase? Concept: Change of State - Latent Heat Capacity.
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