Quantcast

A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

.Sam.

  • one year ago

I'm missing something :p

  • This Question is Closed
  1. .Sam.
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    A sample of ethyl propanoate is hydrolysed by heating under reflux with aqueous sodium hydroxide. The two organic products of the hydrolysis are separated, purified and weighed. Out of the total mass of products obtained, what is the percentage by mass of each product? \(\color{blue}{Ans:}32.4% and 67.6 \)% and \(67.6\)%

  2. .Sam.
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    \[M_r(CH_3CH_2COOCH_2CH_3)=102g/mol\] Separated compounds should be carbox and alcohol right \[M_r(CH_3CH_2COOH)=74g/mol\] \[M_r(HOCH_2CH_3)=46g/mol\] What I've found was 38.3% and 61.7%

  3. mathslover
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    You are correct @.Sam.

  4. .Sam.
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    But the answer is 32.4% and 67.6% :(

  5. mathslover
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    The answer (from wherever it has been taken) is wrong.

  6. mathslover
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    The products of the hydrolysis are correct; the molecular masses are also correct then there is nothing left which could be wrong.

  7. .Sam.
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    Hmm I still can't trust my answer, we'll wait for more opinions from others okay :)

  8. mathslover
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Best choice. :)

  9. emcrazy14
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 4

    You did a mistake in there. The base hydrolysis of esters results in a sodium salt rather than carboxylic acid itself. So, here you'll get sodium propanoate i.e CH3CH2COONa So your Mr will be 96. Now, your percentage by mass of each product will be: (96/142) x 100= 67.6% (46/142) x 100= 32.4%

  10. .Sam.
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    Oh yeah we're not using \(H_2O\) to hydrolyse that ester, derp... Okay got it, thanks @emcrazy14 :)

  11. emcrazy14
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 4

    yw! :)

  12. mathslover
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Oh, I did 96 + 46 = 162 :D , good work @emcrazy14

  13. KL-RC
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    First of all thanks A LOT for posting this question Sam and No wonder, I was thinking that why is he writing a product of esterification?? instead of a sodium salt?? either way thanks you all! ;D

  14. KL-RC
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    and @emcrazy14 you too!! thanks!!! :D

  15. emcrazy14
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 4

    :)

  16. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.