Phase Equilibria & Clausius–Clapeyron

Module 6 · 6 of 8

🧊Phase Equilibria & Clausius–Clapeyron

Reading phase diagrams and vapour-pressure curves

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Reading phase diagrams and vapour-pressure curves

A phase diagram maps which phase is stable at every temperature and pressure. The Clausius–Clapeyron equation quantifies the liquid–vapour boundary, predicting how boiling point shifts with altitude and how vapour pressure climbs with temperature.

Difficulty

intermediate

Time

~30 min

Equations

Practice Qs

Learning Objectives

✓Read a P–T phase diagram: triple point, critical point, coexistence lines
✓Apply the Clausius–Clapeyron equation to vapour pressure
✓Predict how boiling point changes with external pressure
✓Use the Gibbs phase rule F = C − P + 2
✓Recognise Trouton's rule for ΔS_vap

Prerequisites

Gibbs energy & equilibriumNatural logarithms

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