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Answer the following questions based on the $P-T$ phase diagram of $\mathrm{CO}_2$.
(a) $\mathrm{CO}_2$ at 1 atm pressure and temperature $-60^{\circ} \mathrm{C}$ is compressed isothermally. Does it go through a liquid phase?
(b) What happens when $\mathrm{CO}_2$ at 4 atm pressure is cooled from room temperature at constant pressure ?
(c) Describe qualitatively the changes in a given mass of solid $\mathrm{CO}_2$ at $10 \mathrm{~atm}$ pressure and temperature $-65^{\circ} \mathrm{C}$ as it is heated up to room temperature at constant pressure.
(d) $\mathrm{CO}_2$ is heated to a temperature $70^{\circ} \mathrm{C}$ and compressed isothermally. What changes in its properties do you expect to observe?
(a) $\mathrm{CO}_2$ at 1 atm pressure and temperature $-60^{\circ} \mathrm{C}$ is compressed isothermally. Does it go through a liquid phase?
(b) What happens when $\mathrm{CO}_2$ at 4 atm pressure is cooled from room temperature at constant pressure ?
(c) Describe qualitatively the changes in a given mass of solid $\mathrm{CO}_2$ at $10 \mathrm{~atm}$ pressure and temperature $-65^{\circ} \mathrm{C}$ as it is heated up to room temperature at constant pressure.
(d) $\mathrm{CO}_2$ is heated to a temperature $70^{\circ} \mathrm{C}$ and compressed isothermally. What changes in its properties do you expect to observe?
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(a) No, vapour condenses to solid directly.
(b) It condenses to solid directly without passing through the liquid phase.
(c) It turns to liquid phase and then to vapour phase. The fusion and boiling points are where the horizontal line on $P-T$ diagram at the constant pressure of $10 \mathrm{~atm}$ intersects the fusion and vaporization curves.
(d) It will not exhibit any clear transition to the liquid phase, but will depart more and more from ideal gas behaviour as its pressure increases.
(b) It condenses to solid directly without passing through the liquid phase.
(c) It turns to liquid phase and then to vapour phase. The fusion and boiling points are where the horizontal line on $P-T$ diagram at the constant pressure of $10 \mathrm{~atm}$ intersects the fusion and vaporization curves.
(d) It will not exhibit any clear transition to the liquid phase, but will depart more and more from ideal gas behaviour as its pressure increases.
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