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Thread: I need stoichiometry help

  1. #1 I need stoichiometry help 
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    I have CO2 + 2 LiOH -> Li2CO3 + H2OI have to find out how many moles of water there are if I have 5 moles of CO2.I balanced the equation alreadyI have confusion on a few thingsThe mole ratio is 2 to 1, right?After I find the mole ratio what do I do, how does that lead to finding the moles of H2O?Any help is appreciated.


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  3. #2  
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    Quote Originally Posted by PhDemon View Post
    You don't really need the mole ratio of reactants, the important ratio is (moles CO2) in/(moles H2O) outFrom the balanced equation 1 mole of CO2 (reacts with 2 moles of LiOH) and produces 1 mole one mole of H2O and one mole of Li2CO3.So for each mole of CO2 you get one mole of H2O, 5 moles of CO2 (reacting with 10 moles of LiOH) gives 5 moles of water (and 5 moles of Li2CO3).
    Wow that actually helped A LOT.so you need the ratio of what you are given to what you need right?


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  4. #3  
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    Quote Originally Posted by PhDemon View Post
    Basically if the equation is correctly balanced the numbers in front of the compounds are the number of moles that are reacting (on the left hand side) and the number of moles you get (on the right hand side) that's all there is to it.
    Given over 1 and Needed over 1, would that equation work?
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  5. #4  
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    Quote Originally Posted by PhDemon View Post
    I'm not sure what you mean...In the example you have given you get 1 mole of H2O for each mole of CO2 that reacts so that ratio is 1:1, is this what you are asking?
    it told me i had 5 moles of c02 (given) so i put that over. I needed to find out how many moles of h2o i would have, so i put 1 mole of h2o (since that was the coefficient of it) over 1. Then i cross multiplied and divided.
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  6. #5  
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    For example:CO2 + 2LiOH -> Li2CO3, and i need to find out how many moles of LiOH are required to react with 20 moles of CO2. So I put 20 mol of co2 over 1, and then 2 mol LiOH over 1 mol co2
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  7. #6  
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    Quote Originally Posted by PhDemon View Post
    You're overcomplicating things I think. From the equation 1 mole CO2 gives 1 mole H2O, so 5 moles CO2 gives 5 moles H2O. Another example:2NaOH + H2SO4 = Na2SO4 + H2O2 moles of NaOH react with one mole of H2SO4 to give one of Na2SO4 and one mole of water, so if you had 5 moles of NaOH you would get 2.5 moles of water. Can you see how you can get this by inspecting the balanced equation? It really is that simple.
    Oh wow that is easy...and to think i've been struggling with this in class. So if I had 10 moles lf NaOH I would get 5 moles of water?Thank you
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