1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: CHEM: Calculate the volume of water expected if the yield of ester were 100%.

  1. Jan 17, 2010 #1
    1. The problem statement, all variables and given/known data

    Calculate the volume of water expected if the yield of ester were 100%.
    19.0mL of n-propanol (0.25 Mol)
    18.5mL(0.25 Mol) propanoic acid.
    5 drops concentrated sulfuric acid


    2. Relevant equations



    3. The attempt at a solution
    C3H7OH + C3H5COOH ---> C6H12O2 + H2O ( not sure this is right)
     
  2. jcsd
  3. Jan 17, 2010 #2

    Borek

    User Avatar

    Staff: Mentor

    Reaction is wrong - how many carbons in propanoic acid?

    However, this is a very simple case of 1:1:1:1 reaction - how many moles of products do you expect?
     
    Last edited by a moderator: Aug 13, 2013
  4. Jan 17, 2010 #3
    theres 4, which now makes me confused because the experiment was suppossed to create n-propyl Propanoate. Whiich i thought was CH3CH2C(O)OC3H7 or C6H12O2???

    Also wouldnt you just expect there to be One mole of n-propyl Propanoate and one Mole of H20? How do you find the expected volume of water from that?

    So balance equation = 10C3H7OH + 6C3H5COOH = 9C6H12O2 + 4H2O???


    ** Our lab manual says C3H5COOH is propanoic acid**

    So im assuming thats a typo and should be C3H6O2 Which then made my orignal equation correct

    C3H7OH + C3H6O2---> C6H12O2 + H2O
     
    Last edited: Jan 17, 2010
  5. Jan 17, 2010 #4

    Borek

    User Avatar

    Staff: Mentor

    Your manual is wrong, this is a classic mistake.

    What is water density?
     
    Last edited by a moderator: Aug 13, 2013
  6. Jan 17, 2010 #5
    if i recall density of water is 1g/ml.

    So to find Volume you use D=m/v But what is the mass in this case?


     
    Last edited by a moderator: Aug 13, 2013
  7. Jan 17, 2010 #6

    Borek

    User Avatar

    Staff: Mentor

    How many moles? Molar mass?
     
    Last edited by a moderator: Aug 13, 2013
  8. Jan 17, 2010 #7
    1 mol?? or is it 0.25 Our lab manual is very unorganized.. molar mass is 18.0153 g/mol.
     
  9. Jan 17, 2010 #8

    Borek

    User Avatar

    Staff: Mentor

    If they react 1->1, and you start with 0.25 mole, how many moles of water are produced? How many grams it is?
     
    Last edited by a moderator: Aug 13, 2013
  10. Jan 17, 2010 #9
    mass = n x MM
    Therefore 0.25 moles X 18.015 molar mass =4.50 g

    then Volume = mass/density

    Volume= 4.50g/ 1.0g cm^3
    Volume= 4.50 mL??
     
  11. Jan 18, 2010 #10

    Borek

    User Avatar

    Staff: Mentor

    Wasn't that hard :wink:
     
    Last edited by a moderator: Aug 13, 2013
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook