Dalton's Law
Calculate total pressure and partial pressures of gas mixtures using Dalton's Law of Partial Pressures. The total pressure of a gas mixture equals the sum of the partial pressures of individual gases.
Dalton's Law of Partial Pressures
The total pressure exerted by a mixture of gases is the sum of the partial pressures of the individual gases:
ptotal = p1 + p2 + ... + pn = Σ pi
For an ideal gas, the partial pressure is calculated using:
pi = (n × R × T) / V
Where:
- ptotal = total pressure (Pa, psi)
- pi = partial pressure of individual gas (Pa, psi)
- n = number of moles of the gas
- R = universal gas constant (8.3145 J/(mol·K))
- T = absolute temperature (K)
- V = volume (m³)