April 18, 2024, 07:37:21 PM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: Bond breaking and bond forming :(  (Read 5657 times)

0 Members and 1 Guest are viewing this topic.

Offline xpressmusic

  • New Member
  • **
  • Posts: 4
  • Mole Snacks: +0/-0
Bond breaking and bond forming :(
« on: May 05, 2011, 12:40:39 PM »
Hi, plz help me solving this... ive tried but useless... :(

here's an equation ...

C40 H82 ------> C16 H34   +   2C12H24

considering bonds broken and formed ONLY, what's the enthalpy change of this reaction ???
Logged

Offline sjb

  • Global Moderator
  • Sr. Member
  • ***
  • Posts: 3652
  • Mole Snacks: +222/-42
  • Gender: Male
Re: Bond breaking and bond forming :(
« Reply #1 on: May 05, 2011, 04:43:12 PM »
Quote from: xpressmusic on May 05, 2011, 12:40:39 PM
Hi, plz help me solving this... ive tried but useless... :(

here's an equation ...

C40 H82 ------> C16 H34   +   2C12H24

considering bonds broken and formed ONLY, what's the enthalpy change of this reaction ???

What sort of level are you asking the question at? Are you aware of the differences, for instance between primary, secondary, tertiary and quaternary carbons? What do you know of degrees of unsaturation?
Logged

Offline Vidya

  • Full Member
  • ****
  • Posts: 839
  • Mole Snacks: +46/-62
  • Gender: Female
  • Online Chemistry and Organic Chemistry tutor
    • Online Chemistry Tutor
Re: Bond breaking and bond forming :(
« Reply #2 on: May 05, 2011, 10:13:18 PM »
You need to calculate the degree of unsaturation

then count how many c-c or c=c or C-H bonds are broken or formed .Bond breaking is endo and bond formation is exo.
So take care of the signs also.



Logged

Offline xpressmusic

  • New Member
  • **
  • Posts: 4
  • Mole Snacks: +0/-0
Re: Bond breaking and bond forming :(
« Reply #3 on: May 21, 2011, 02:38:54 AM »
That is what I am asking how do I calculate how many bonds broken or formed...could you please help me further :)
Logged

Offline sjb

  • Global Moderator
  • Sr. Member
  • ***
  • Posts: 3652
  • Mole Snacks: +222/-42
  • Gender: Male
Re: Bond breaking and bond forming :(
« Reply #4 on: May 21, 2011, 02:44:39 AM »
Quote from: xpressmusic on May 21, 2011, 02:38:54 AM
That is what I am asking how do I calculate how many bonds broken or formed...could you please help me further :)

What is the valency of hydrogen, and of carbon?
Logged
Pages: [1]   Go Up
« previous next »
Sponsored Links