 Okay, so this is a good one. This is like pv equals nRT. Anyways, a sample of nitrogen gas stored in a 4 liter container at 32 degrees Celsius exerts a pressure of 5.0 atm. Calculate the number of moles of nitrogen. Okay, so we've got a volume. Temperature is 32 degrees Celsius, but we want to convert that to Kelvin, right? So we're going to add that to 273. So it's going to equal 305. Thank you. 305 Kelvin. And it exerts a pressure of 5.0 atm. Calculate the number of moles. So n. And we know r, 0.21, I'm sorry, atm liter. You can figure that out eventually anyway. Okay, so we use the equation pv equals nRT. Okay, and we're looking for n. So we've got to divide both sides by RT. RT cancels that. We've got n equals pv over RT. And now we just plug everything in. So p5.0 atm times v over r is equal to 0.821 atm times liter over 1 mole Kelvin. And you multiply that by 305. Okay, so now we're going to just have to multiply and divide. So you see here, atm cancels with that atm, right? Liter cancels with that one. And then 1 over something. So it's over over. It's going to be the inverse. So the Kelvin will cancel there. You can also think of it like this is its own problem, right? So where Kelvin is going to cancel. Okay, so now we've got mole over over again. Right? So this is going to be moles out here. So now all we have to do is multiply this out. So 5 times 4 divided by 0.821 divided by 305. And the number of moles I got is 0 moles.