General Chemistry 1 - Week 8

Partial pressure

refers to the pressure exerted of a gas in a mixture if it is the only gas present in the container.

Pi = XiPt

Gas stoichiometry

involves the mass relationships in a chemical reaction whereas gas is either reactant or product.

PV=nRT
PV = m/MM RT

Graham's Law of diffusion/effusion

states that, the rate of effusion of any gas is inversely proportional to the square root of the molecular weights or densities.

Effusion

is the process in which a gas escapes through a small hole.

Diffusion

when particles move to a lower area of concentration from a high area of concentration.

Dalton's Law of Partial Pressures

states that the total pressure of a mixture of gases is the sum of the partial pressures of its components.

Pt = P1 + P2 + P3 + ... + Pn

The mole fraction (xi)

s the number of moles of that gas divided by the total moles of gas in the mixture.

Xgas A + Xgas B =

Effusion and Diffusion

states that the rate
of effusion or diffusion of a gas is inversely proportional to the square root of its molar mass.

Scottish chemist Thomas Graham (1805-1869)