 So let's do a mole fraction problem. This one says Make sure of gases contains 4.46 moles of neon 0.74 moles of argon and 2.15 moles of xenon. Find the mole fraction for each of these gases. So remember mole fraction capital X So the mole fraction of a gas is going to be the number of moles of that gas divided by the number of moles total. So we got to figure out. Well, what's the total number of moles? Let's do that 4.46 plus 0.74 plus 2.17 0.35 Total number of moles So, how do we figure out? Well, what's the mole fraction of neon? What do we put on top? 4.46 moles divided by 7. The mole fraction of argon What's going to be on top? 0.74 moles And on the bottom 7.35 moles, right? And the mole fraction of xenon What's that going to be? 3.15 moles divided by 7.35 moles. Watch. Moles cancel in each one of these. Mole fraction is unit. 4.46 divided by 7.35 So 6.07, right? 0.607 The mole fraction for neon 0.74 divided by 7.35 0.10 The mole fraction for argon Only two sick pics on that one, right? And 2.15 divided by 7.35 That's going to be 0.293 The mole fraction for xenon is 0.293 Let's figure out the partial pressure for just one of these. What do you say? Okay So, how would we do that? Uh Anything equals that on our team? Oh, but we didn't write down the rest of the problem. Okay, sorry. We just can't kill this one. I didn't give you the rest of the problem today.