Partial Pressure and Dalton's Law (5.2.2) Flashcards
• Dalton’s law of partial pressures states that the total pressure of a mixture of
gases is the sum of the partial pressures of the individual gases.
• Dalton’s law of partial pressures states that the total pressure of a mixture of
gases is the sum of the partial pressures of the individual gases.
The partial pressure of a gas is the pressure exerted
by that gas in a mixture of gases.
Dalton’s law of partial pressures states that the total
pressure (PT) of a mixture of gases is the sum of the
partial pressures of the individual gases (PA, PB, PC,
etc).
Stated mathematically, PT = PA + PB + PC + …
A 10.0 L container of helium at 3.6 atm is separated
from a 4.2 L container of nitrogen at 6.7 atm by a
valve. What is the total pressure after the valve has
been opened?
First, solve for the partial pressure of each gas in
the final volume using Boyle’s law (PiVi = PfVf).
The total pressure is the sum of the two partial
pressures. Notice that total pressure (4.5 atm) is
between the two initial pressures.
The mole fraction (X) is the moles of a substance
(nA) divided by the total moles of all substances in a
mixture (nT). The mole fraction is related to the
partial pressure by the equation PA = XAPT
The partial pressure of a gas is the pressure exerted
by that gas in a mixture of gases.
Dalton’s law of partial pressures states that the total
pressure (PT) of a mixture of gases is the sum of the
partial pressures of the individual gases (PA, PB, PC,
etc).
Stated mathematically, PT = PA + PB + PC + …
A 10.0 L container of helium at 3.6 atm is separated
from a 4.2 L container of nitrogen at 6.7 atm by a
valve. What is the total pressure after the valve has
been opened?
First, solve for the partial pressure of each gas in
the final volume using Boyle’s law (PiVi = PfVf).
The total pressure is the sum of the two partial
pressures. Notice that total pressure (4.5 atm) is
between the two initial pressures.
The mole fraction (X) is the moles of a substance
(nA) divided by the total moles of all substances in a
mixture (nT). The mole fraction is related to the
partial pressure by the equation PA = XAPT
