Dalton's Law Calculator

Calculate Partial Pressures and Total Pressure with Precision

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Total Pressure Calculator

Calculate total pressure from partial pressures of gases in a mixture.

Total Pressure: - atm

Partial Pressure Calculator

Calculate partial pressure from mole fraction and total pressure.

Partial Pressure: - atm

Mole Fraction Calculator

Calculate mole fraction from partial pressure and total pressure.

Mole Fraction: -

Understanding Dalton's Law

What is Dalton's Law?

Dalton's Law of Partial Pressures states that the total pressure of a mixture of gases equals the sum of the partial pressures of each individual gas. Mathematically:

Ptotal = P₁ + P₂ + P₃ + ...

Pi = XiPtotal

Key Concepts

Important aspects of Dalton's Law:

  • Gases must not react with each other
  • Each gas behaves independently
  • Temperature is constant for all gases
  • Pressure units must be consistent
  • Applies to ideal gas mixtures

Historical Context

Dalton's contributions:

  • Discovered by John Dalton in 1801
  • Part of his atomic theory
  • Revolutionized gas chemistry
  • Led to understanding of atmosphere
  • Influenced modern gas laws

Real-World Applications

Dalton's Law is used in:

  • Respiratory physiology
  • Atmospheric science
  • Diving medicine
  • Industrial gas mixtures
  • Gas separation processes
  • Air pollution studies

Limitations and Assumptions

Dalton's Law assumes:

  • Ideal gas behavior
  • No chemical reactions
  • Constant temperature
  • Constant volume
  • No intermolecular forces

Essential Dalton's Law Formulas

Total Pressure

Ptotal = P₁ + P₂ + P₃ + ...

Partial Pressure

Pi = XiPtotal

Mole Fraction

Xi = Pi/Ptotal