 Okay, so let's try this one now. So Balance the equation then calculate the number of grams of carbon dioxide formed when 4.30 moles of propane react with oxygen Okay, so the first thing we want to do is balance the equation obviously We want to balance it in that order carbon, hydrogen and oxygen So there's three carbons over here, and there's only one carbon over here so we're going to have to multiply one times something to equal three All right, so what is the times one? That's going to be three, right? So we put a three there Okay, so there's three and three that's balance Now we've got eight Hydrogens here and only two here. So what times two equals eight? Oh, so now we've got eight over there and eight over there So now we want to come over here and figure out a number of oxides, right? So we got four here Plus two times three that's six. So we have ten here, right? We only got two here So what times two equals ten? Five. That was an easy one, sorry guys I should have given you a little longer one But whatever. So we got our equation balancing, okay? So now let's figure out what this thing is saying. So balance the equation and calculate the number of grams Who want to figure out the number of grams? So the mass of carbon dioxide when 4.30 moles of propane react with oxygen So remember in the chemical equation Why do we care about balancing it? Because it gives us the ratio of the number of moles, okay? So we have a one to five to three to four ratio, the number of moles The ones that we care about of course are this Or this, right? We care about this one to three ratio there, okay? Because it's asking us this to that Okay, that's one to three So first thing we want to do is figure out the number of moles of carbon dioxide we have How do we do that? Number of moles of carbon dioxide equals the number of moles of propane, which is 4.30 moles Three moles of CO2 Very good. Oh, that's propane So we Cancels the number of moles of propane, right? And we get over here moles of carbon dioxide 4.30 times 3 12.9 12.9 moles Carbon dioxide, but it doesn't ask us how many moles of carbon dioxide we got we want to know how many grams of carbon dioxide we have So we want to know the mass of carbon dioxide How do we do that? We take the number of moles and multiply it by Molecular ways of carbon dioxide. Okay, there's a molar mass. What's the molar mass of carbon dioxide? So carbon 1 times 12.01 32 plus 12.01 It's going to be 44.01 Grants on the top because moles want to cancel, they want to cancel. Cancel has the number of moles 12.9 times 44.01 568 grams That's the answer, yeah, unless you want to put it in a kilograms or something But I guess it asks the number of grams, so