Besides finding the moles of a gas sample, the ideal gas law can be extended further to find the molar mass of a gas. Here we're going to look at the easy way on how we were able to derive the ideal gas law to this new version. Besides this easy method, we have a harder method. You can click on the next video to see how I derived this formula, but again, only look at that video if your professor cares on showing how you derive this new version of the ideal gas law.
If your professor doesn't care, then just ignore that video and justice go on to the next question. What we have to solve for a problem. All right. So here to help us remember this one, we're going to say more mass really tests our valuable patience. So here molar and then mass really tests RT. They are over valuable patients, which is volume and pressure. Here I just kept them in the order of PV.
So this is the formula we can utilize to find the molar mass of a gas immediately instead of doing it piece by piece like we did in previous example questions. So just remember, molar mass really tests our valuable patience M=mRT/PV. So now that we've seen this easy method, you can click on to the next video to look at how I derived this formula, or you can skip that video and just head straight to questions or utilize this particular newly derived ideal gas law formula.