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Enthalpy change

Enthalpy change

(Science: chemistry) in a reaction, this is more or less equal to the difference between the energy put into breaking bonds and the enery gained from new bond formation.


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Re: How do i know if a reaction is endothermic or exothermic?

Change in enthalpy = sum of bond energies of reactants - sum of energies of products = Total input energy – Total output energy ...

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by jonmoulton
Mon Nov 04, 2013 4:07 pm
 
Forum: General Discussion
Topic: How do i know if a reaction is endothermic or exothermic?
Replies: 1
Views: 1251

How do i know if a reaction is endothermic or exothermic?

... but it was wrong. It should be endothermic. This is how i solved it: Enthalpy Before: 2(340) = 680 Enthalpy After: 498 Change in Enthalpy: 498 - 680= -182 Therefore, the reaction is exothermic because energy is ...

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by VxW
Sun Nov 03, 2013 6:39 pm
 
Forum: General Discussion
Topic: How do i know if a reaction is endothermic or exothermic?
Replies: 1
Views: 1251

enthalpy change

Consider the thermochemical equations given below. C2H4(g) + 3 O2(g) → 2 CO2(g) + 2 H2O(l) ΔH° = −1411 kJ (per mol C2H4) C(s) + 3 H2 (g) + ½ O2(g) → C2H5OH(l) ΔH° = −278 kJ (per mol C) C2H4(g) + H2O(l) → C2H5OH (l) ΔH° = −44 kJ (per mol C2H4) What is ΔH° for the following reaction? All the answers b...

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by Darwin420
Wed Dec 03, 2008 11:19 pm
 
Forum: General Discussion
Topic: enthalpy change
Replies: 2
Views: 3883

Chemical properties of chloroform

... it in physics as c. Remember this formula? in order to count the enthalpy change, you've to use: delta[H] = m . c . delta[T] the c is the specific heat. The scale of ...

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by victor
Wed Feb 08, 2006 10:16 am
 
Forum: Cell Biology
Topic: Chemical properties of chloroform
Replies: 15
Views: 13625

potential energy

Let me give this: In vitro way: ATP ----> ADP + Pi Enthalpy change = 7.33 kkal/mole Glucose + 6O2 ----> 6CO2 + 6H2O Enthalpy change = 686 kkal/mole In vivo ...

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by victor
Fri Oct 21, 2005 11:39 am
 
Forum: Molecular Biology
Topic: potential energy
Replies: 39
Views: 16833


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