Aussiek

Hi there, Just stuck on another part of study - If 4 mole of glucose reacts with excess oxygen, O2, how many mole of carbon dioxide CO2 would be produced? So glucose i know is C6H12O6 1) What i don't understand is - am i working this equation out on the molar mass of each (to get the mols of CO2), or is it just as simple as multiplying 6mols of Carbon with the 4 mols of Glucose to produce 24mols of CO2? 2) What i also don't get is, why would it state there is excess Oxygen, but not tell me a quantity, or mass etc. Does glucose reacting with excess oxygen change how much CO2 would be produced? 3) Is question 2 above linked to the metabolism of Glucose in the presence of oxygen producing the following: C6H12O6 + 6O2 ----- 6CO2 + 6H2O But, will that have anything to do with the initial question being asked, due to the fact i'm only told about excess O2 but not an exact amount. Hopefully all that makes sense, just so many question about it going on in my poor brain. So glad my next topic is Biology and i'm almost done with Chemistry.

Thank you both of you for assisting with this. Last night when i saw your picture John, it didn't make sense - but this morning it does. It finally clicked that i'm not just looking at a pentagon, i'm also looking at the bonds coming off the pentagon which has now been shown in the above picture (thank you). I had just come on to say i realised because i need carbon on the ends and the bends, then the diagram would actually indicate C8H14 - which is what is shown in the extended diagram above. Totally get now why everything isn't written it, it does look very messy and hard to read! Although it was also, initially, hard to make sense off without all that showing - but i finally get it! Ahhhhh, glad i can move on to the rest of my chemistry work now understanding this. Unlike others in my class who have decided to bypass it, i knew it was something i had to know as i know it'll pop up again further down the track. Thank you so much both of you.

Hello John, Thank you so much for your explanation - it is making much more sense than anything i've come across in my study material! I'm not sure where the 14 hydrogen bonds come from, i get 12? (does the top point not already have 2 bonds, therefore only 2 hydrogens, and the bottom right point have 3 bonds so would only have 1 hydrogen?). I thought the maximum bonds a pentagon could have was 12? So if i am writing it into a molecular formula, do i add in the carbons and hydrogens i can't see - i.e c5h12 (pentane). I really appreciate your help!!! i'm much happier with biology or finance!!

Hi there, I don't have a chemistry background, so am struggling a bit with this one. I am required to convert the (shown) molecule to a molecular formula, but i'm not understanding how to do this. I thought maybe it was as simple as just adding everything up, i.e answer C3H9, but realise C3H9 can't be the right answer. Is it a matter of dropping a Hydrogen due to not having enough bonds on the Carbon, therefore the answer would be C3H8? I'm just not sure of the process how on to look at the structure given and write the molecular formula for the molecule. Fortunately i'm not the only one in class that is stuck on this too, we really haven't been given clear information on what the process is, everyone else has just moved on from it, but i don't like to move on unless i understand something. Any help given will be much appreciated.