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Homework Help: Finding Mass through Stoichiometry of Ethanol in a chemical equation

  1. Feb 1, 2012 #1
    1. The problem statement, all variables and given/known data

    1) What is the mass of 100% Ethanol?
    2) How much ethanol would be expected from 18% glucose solution?
    3) What else will be generated? How can we calculate this amount?

    Given:

    Fermentation Equation:

    C6H12O6(aq) + 2C2H5OH(aq) + 2CO2(g) + Heat
    (glucose) (ethanol) (carbon dioxide)


    Molecular Weight of Ethanol = 46.7 g/mol
    Density of Ethanol = 0.789 g/cm3
    2% glucose solution contains 20g/L of glucose


    2. Relevant equations
    D=M/V



    3. The attempt at a solution
    To be honest I'm not sure where to start to attempt this question. A friend of mine sent me this question last night for her assignment and I was stumped. I just wanted to know if someone could help explain how I could find the mass of ethanol with only the variables given to me. I've asked my friend and she keeps insisting there were no other variables. I haven't touched chemistry in years and was just wondering if someone could refresh my memory.
     
    Last edited: Feb 1, 2012
  2. jcsd
  3. Feb 1, 2012 #2
    how do you find an extensive variable from an intensive variable???

    lol tell him he is missing some info
     
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