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Topic: Bond breaking and bond forming :(  (Read 5971 times)

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Offline xpressmusic

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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 ???
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Offline sjb

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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?
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Offline Vidya

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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.



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Offline xpressmusic

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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 :)
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Offline sjb

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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?
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