Question

Q1 [20 pts]: Consider the phase diagram for CO$_2$. Pressure (not to scale) 72.9 atm Y D Critical Supercritical fluid point Z Liquid 5.1 atm 0 Solid Triple point 1 atm Gas B X -78.5°C -56.7°C Temperature (not to scale) 31°C (a) [5 pts] State the phase change that a sample of CO$_2$ undergoes from point Y to X. (b) [5 pts] What is the sign of the enthalpy change in (a) (previous question). (c) [5 pts] State the phase change that a sample of CO$_2$ undergoes from point Y to Z. (d) [5 pts] What is the sign of the enthalpy change in (c) (previous question).

          Q1 [20 pts]: Consider the phase diagram for CO$_2$.
Pressure (not to scale)
72.9 atm
Y
D
Critical Supercritical
fluid
point
Z
Liquid
5.1 atm
0
Solid
Triple
point
1 atm
Gas
B
X
-78.5°C -56.7°C
Temperature (not to scale)
31°C
(a) [5 pts] State the phase change that a sample of CO$_2$ undergoes from point Y to X.
(b) [5 pts] What is the sign of the enthalpy change in (a) (previous question).
(c) [5 pts] State the phase change that a sample of CO$_2$ undergoes from point Y to Z.
(d) [5 pts] What is the sign of the enthalpy change in (c) (previous question).

Q1 [20 pts]: Consider the phase diagram for CO2.
Pressure (not to scale)
72.9 atm
Y
D
Critical Supercritical
fluid
point
Z
Liquid
5.1 atm
0
Solid
Triple
point
1 atm
Gas
B
X
-78.5°C -56.7°C
Temperature (not to scale)
31°C
(a) [5 pts] State the phase change that a sample of CO2 undergoes from point Y to X.
(b) [5 pts] What is the sign of the enthalpy change in (a) (previous question).
(c) [5 pts] State the phase change that a sample of CO2 undergoes from point Y to Z.
(d) [5 pts] What is the sign of the enthalpy change in (c) (previous question).

Added by Timothy H.

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