Up to this point we've used the ideal gas law to help us isolate pressure, volume, moles or temperature. But now we're going to be faced with a new but old topic, the idea of molar mass. Now recall molar mass represents the mass of a substance divided by the amount of that substance.
If we take a look here, we're going to say that this capital M represents the molar mass of the gas and lower case m here equals the mass of the gas in grams, and N we know from the ideal gas law equals the amount of the gas in moles, so molar mass equals grams per mole. Now that we remember what molar mass is, we're going to take a look at how we can use the ideal gas law to find the molar mass of a gas South.
For now, click on the next video and let's take a look at an example question.