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Vapor Pressure Calculator

P₁ (Pa)

T₁ (K)

T₂ (K)

ΔHvap (J/mol)

What is Vapor Pressure Calculator?

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Vapor pressure increases exponentially with temperature (Clausius-Clapeyron): ln(P₂/P₁) = -ΔH_vap/R × (1/T₂ - 1/T₁).

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How to Vapor Pressure Calculator

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1Input substance, temperature(s), enthalpy of vaporization
2Calculate vapor pressure
3Predict boiling point

Worked Examples

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Example 1

Given:Water at 25°C: P = 23.8 mmHg

परिणाम:At 100°C: P = 760 mmHg (boiling point)

Real-World Applications

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Chemistry laboratory experiments and analysis

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Industrial chemical process design

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Academic coursework and research in chemistry

Frequently Asked Questions

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What's normal boiling point?

Temperature where vapor pressure equals 1 atm; varies with atmospheric pressure.

Common Mistakes to Avoid

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!Using Clausius-Clapeyron beyond valid range
!Not assuming constant ΔH_vap

References

›Vapor Pressure — Wikipedia

📖Difficulty:Intermediate

Accuracy-checked

Reviewed October 2026

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