## Graham’s Law of Effusion Practice Problems

In the previous post, we talked about the Graham’s law which shows that the rate of effusion of a gas is inversely proportional to the square root of its molar mass:   ${u_{{\rm{rms}}}}\;{\rm{ = }}\;\sqrt {\frac{{{\rm{3RT}}}}{{\rm{M}}}}$   One application … Read more

## How to Know Which Gas Law Equation to Use

How do you know which ideal gas equation to use when solving a problem? Fortunately, there is a short answer to this, and it is the combined gas law equation:     It allows you not to memorize all the … Read more

## Gas Laws Practice Problems

The following practice problems are to master to topics on the ideal gas laws: Boyle’s law, Charles’s law, and Avogadro’s Law, as well as the combined gas law equation. There are examples to work on the Dalton law of partial … Read more

## Gases in Chemical Reactions

Sometimes the amounts of gases need to be calculated based on chemical reactions. These calculations combine the ideal gas laws and the same principles we learn in stoichiometric calculations. The only difference for most problems is going to be that the … Read more

## Mole Fraction and Partial Pressure of the Gas

In the previous post, we talked about partial pressures and the Dalton law. Today, we will see how the mole fraction and partial pressures of a gas are related. Remember, mole fraction (Χ) is the ratio of the moles of … Read more

## Dalton’s Law of Partial Pressures

To understand the partial pressures, let’s suppose a certain amount of gas “A” is added to the tank and extorts 5 atm pressure, and in another tank with gas “B” the pressure is 3 atm:     Now, it turns … Read more

## Graham’s Law of Effusion

The mixing of different gas molecules by random molecular motion and frequent collisions is called diffusion. An example of this can be the raid odor spread of perfume when the stopper is removed. Effusion is a similar process in which … Read more

## Molar Mass and Density of Gases

Density and molar mass are calculated by modifying the ideal gas law equation. What we do is first replace the moles (n) in PV = nRT with mass over the molar mass:                  … Read more

## Combined Gas Law Equation

The combined gas law is obtained by rearranging the ideal gas law, from PV = nRT. From this, we obtain an expression for the R:   ${\rm{R}}\; = \;\frac{{{\rm{PV}}}}{{{\rm{nT}}}}$   Now, because R is constant, this expression is true for … Read more

## Ideal Gas Laws

The ideal gas laws show the correlation of the temperature, pressure, volume, and the amount of a gas. Although, this is not how the laws were determined, I found my students grasping the concepts a lot easier using the following … Read more