okay so part a: Cbr4: 212.5 AND THEN FOR GASOUS CBR4 IS 358.1 then for B: CHCl3 gas is: 265.7 and then liquid:201.7

To clarify, it seems you’re looking to calculate or interpret changes in thermodynamic properties (possibly enthalpy or entropy) for different phases of \( \text{CBr}_4 \) and \( \text{CHCl}_3 \). Here’s the breakdown based on your details:

1. **For \( \text{CBr}_4 \):**
   - Solid phase: \( 212.5 \ \text{J/mol} \)
   - Gas phase: \( 358.1 \ \text{J/mol} \)

2. **For \( \text{CHCl}_3 \):**
   - Gas phase: \( 265.7 \ \text{J/mol} \)
   - Liquid phase: \( 201.7 \ \text{J/mol} \)

Typically, the transition between phases involves changes in enthalpy (ΔH) or entropy (ΔS). If the values represent enthalpies or entropies, we could calculate the change during phase transitions:

### Sample Calculations (Assuming Entropy Values):
If these are **entropy values**:
   - The entropy change from solid to gas for \( \text{CBr}_4 \):  
     \[
     \Delta S_{\text{solid→gas}} = S_{\text{gas}} - S_{\text{solid}} = 358.1 - 212.5 = 145.6 \ \text{J/K·mol}
     \]
   - The entropy change from liquid to gas for \( \text{CHCl}_3 \):  
     \[
     \Delta S_{\text{liquid→gas}} = S_{\text{gas}} - S_{\text{liquid}} = 265.7 - 201.7 = 64.0 \ \text{J/K·mol}
     \]

If these are **enthalpy values** instead, similar principles apply but would represent energy changes rather than entropy changes.

Let me know if you'd like detailed steps for enthalpy or entropy calculations, or if there's another aspect you’d like to explore!

### Related Questions:
1. How is the entropy change calculated for a phase transition?
2. What factors influence the enthalpy of vaporization of a substance?
3. How does entropy typically differ between solid, liquid, and gas phases?
4. Why is the entropy of gases generally higher than that of solids and liquids?
5. How can these values help determine spontaneity of phase changes?

**Tip:** When transitioning between phases, gases generally have higher entropies than liquids and solids due to the increased freedom of particle motion.

Explore the calculation of entropy and enthalpy changes for phase transitions of CBr4 and CHCl3. This problem involves thermodynamic principles, covering entropy changes for solid-to-gas and liquid-to-gas transitions. Ideal for students in undergraduate thermodynamics.

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