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Enthalpies

Posted: Tue Jan 28, 2020 10:26 pm
by Lindsey Chheng 1E
Can someone help to explain the difference between standard enthalpy of reaction and standard enthalpy of formation?

Re: Enthalpies

Posted: Tue Jan 28, 2020 10:35 pm
by AArmellini_1I
Standard reaction enthalpy is the enthalpy of the P and R at their most stable point. Standard enthalpy of formation is the summation of all the R and P standard reaction enthalpy [I think but I may have messed this up]

Re: Enthalpies

Posted: Tue Jan 28, 2020 11:39 pm
by Alice Ma 2K
The standard enthalpy of formation is the enthalpy change between the elements in their standard state (reactants) and the compounds (products). The standard enthalpy of reaction is the heat given off or taken up for the reaction, in other words, the enthalpy difference between the reactants and the products.

Re: Enthalpies

Posted: Tue Jan 28, 2020 11:45 pm
by Minh Ngo 4G
Standard enthalpies of formation is when all the R are in their most stable state, forming P

Re: Enthalpies

Posted: Wed Jan 29, 2020 7:23 pm
by gabbymaraziti
The standard enthalpy of formation is the change in enthalpy that accompanies the formation of one mole of a compound from its elements. The standard enthalpy of reaction is the change in enthalpy that occurs in a system when one mole of matter is transformed by a chemical reaction.