The temperature on a sample of pure X held at 17.0 atm and - 68. °C is increased until the sample boils. The temperature is then held constant and the pressure is decreased by 9.8 atm. On the phase diagram below draw a path that shows this set of changes. 32 100 200 300 temperature (K) pressure (atm)

Chemistry
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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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**Transcription for Educational Website**

### Context:

The text and graph pertain to a thermodynamic experiment involving a sample of a substance, referred to as pure X, undergoing temperature and pressure changes until boiling occurs.

**Text:**
"The temperature on a sample of pure X held at 17.0 atm and –68 °C is increased until the sample boils. The temperature is then held constant and the pressure is decreased by 9.8 atm. On the phase diagram below draw a path that shows this set of changes."

**Graph Description:**
- **Axes:**
  - The x-axis represents temperature in Kelvin (K), ranging approximately from 0 K to 300 K.
  - The y-axis represents pressure in atmospheres (atm), ranging from 0 atm to 32 atm.

- **Curve:**
  - A curve is plotted that represents phase boundaries. 
  - Starting from high pressure on the left upper side of the graph, the initially steep downward curve indicating the phase boundary reduces in pressure sharply.
  - After reaching a sort of minimum, the curve changes direction and increases, indicating a different phase change occurring at higher temperatures.

**Experiment Objective:**
- Begin at a point marked by the coordinates representing 17.0 atm and a temperature corresponding to –68 °C (205 K approximately).
- Follow the experimental path on the graph to show an increase in temperature until the substance boils.
- Once boiling starts (indicated by reaching the phase boundary line), maintain constant temperature while reducing the pressure by 9.8 atm.

**Instructions:**
- Accurately plot the process path on the phase diagram graph to visualize how temperature and pressure interact during the experiment.

This exercise involves using the phase diagram to understand typical behavior of substances under different thermodynamic conditions, particularly transitions between phases like solid, liquid, and gas.
Transcribed Image Text:**Transcription for Educational Website** ### Context: The text and graph pertain to a thermodynamic experiment involving a sample of a substance, referred to as pure X, undergoing temperature and pressure changes until boiling occurs. **Text:** "The temperature on a sample of pure X held at 17.0 atm and –68 °C is increased until the sample boils. The temperature is then held constant and the pressure is decreased by 9.8 atm. On the phase diagram below draw a path that shows this set of changes." **Graph Description:** - **Axes:** - The x-axis represents temperature in Kelvin (K), ranging approximately from 0 K to 300 K. - The y-axis represents pressure in atmospheres (atm), ranging from 0 atm to 32 atm. - **Curve:** - A curve is plotted that represents phase boundaries. - Starting from high pressure on the left upper side of the graph, the initially steep downward curve indicating the phase boundary reduces in pressure sharply. - After reaching a sort of minimum, the curve changes direction and increases, indicating a different phase change occurring at higher temperatures. **Experiment Objective:** - Begin at a point marked by the coordinates representing 17.0 atm and a temperature corresponding to –68 °C (205 K approximately). - Follow the experimental path on the graph to show an increase in temperature until the substance boils. - Once boiling starts (indicated by reaching the phase boundary line), maintain constant temperature while reducing the pressure by 9.8 atm. **Instructions:** - Accurately plot the process path on the phase diagram graph to visualize how temperature and pressure interact during the experiment. This exercise involves using the phase diagram to understand typical behavior of substances under different thermodynamic conditions, particularly transitions between phases like solid, liquid, and gas.
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