Question
List the phases that would be observed if a sample of $\mathrm{CO}_{2}$ at 10 atm pressure were heated from $-80^{\circ} \mathrm{C}$ to $-40^{\circ} \mathrm{C}$.
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Refer to the phase diagram of $\mathrm{CO}_{2}$ in Active Figure $13-17 \mathrm{~b}$ to answer this. List the phases that would be observed if a sample of $\mathrm{CO}_{2}$ at 10 atm pressure were heated from $-80^{\circ} \mathrm{C}$ to $-40^{\circ} \mathrm{C}$.
What phases of $\mathrm{CO}_{2}$ are present (a) at a temperature of $-78^{\circ} \mathrm{C}$ and a pressure of $1.0 \mathrm{~atm}$ ? (b) at $-57^{\circ} \mathrm{C}$ and a pressure of $5.2 \mathrm{~atm} ?$
Consult Figures $10.26,10.28,$ and 10.29. What phase changes, if any, occur if $\mathrm{CO}_{2}$ initially at $-80^{\circ} \mathrm{C}$ and 8.0 atm is allowed to warm to $-25^{\circ} \mathrm{C}$ at 5.0 atm?
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