 Okay, so let's do this one. It says, loratidine marked as an anti-allergy medication under the name Claritin has four rings and eight pi bonds and the molecular formula of C22HX ClN2O2 How many hydrogens does loratidine have? Okay, so From what we did in the last couple of problems, okay, so what do we say when we have Halogens what's gonna happen? What are we going to do? And we've got an oxygen. So what happens when we have an oxygen? Yeah, no hydrogens, and then we also have a nitrogen in here. What do we do there? Subtract, so we got subtract one hydrogen for each nitrogen, so in this case we're going to subtract two So The other thing we know is that the number of rings plus pi bonds and double that for the number of hydrogens, right? So we're gonna 24 hydrogens to start off like that So what did we say for every chlorine? We're gonna add a hydrogen, right? And for every nitrogen We're gonna subtract two so plus one hydrogen Okay, and then minus Two hydrogens, so that gives us 23 hydrogens, right? So much easier than the way that you were calculated Any questions on that one? Wonderful