 So this one says calculate the energy of the n equals 3 state in the hydrogen atom and Joules per atom and then calculate it in Joules per mole, okay? so It said n equals 3 state So in this equation or in this problem, we're going to have to use the Borsi or Borsi equation So what was that? E n equals negative r h c over n squared Okay, so I have to give you r h and c So let's go ahead and look use things in so So Here we do this we should see that meters will cancel out Seconds will cancel out and we should we get units of Joules That's units of Joules good energy units Right. Yeah, so energy So if you wanted to be anyway, so let's multiply this thing out So again, we're expecting we should be expecting a very small number because this is only one half Okay, so let's Hopefully we get some and this can go to as many sick things as you want 2.4 to 10 to the negative 19 Joules per at any questions on that part So it also asked us to figure out how many kilojoules per mole we've got okay, so let's do that part now So that's Joules per at every solve of this step up here Everybody have this though. Okay, so that's Joules per atom, right? So two more Joules per mole. How do we do that by a thousand? Any questions on doing something like this, okay good