standard enthalpy of formation

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Ishita Monga 1B
Posts: 31
Joined: Thu Jul 27, 2017 3:00 am

standard enthalpy of formation

Postby Ishita Monga 1B » Mon Jan 22, 2018 9:26 pm

What is the difference between standard enthalpy of formation and standard reaction enthalpy?

veneziaramirez 3I
Posts: 57
Joined: Fri Sep 29, 2017 7:07 am

Re: standard enthalpy of formation

Postby veneziaramirez 3I » Mon Jan 22, 2018 9:40 pm

Standard reaction enthalpy is when the reactants and products in a reaction are in their standard state at 1 atm. Standard enthalpy of formation is the standard reaction enthalpy for the formation of one mole of a substance from its element in their most stable form.

Dang Lam
Posts: 55
Joined: Thu Jul 27, 2017 3:01 am

Re: standard enthalpy of formation

Postby Dang Lam » Tue Jan 23, 2018 11:48 am

so does this mean that delta Hf is similar to delta Hrxn?

Tatiana Hage 2E
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Re: standard enthalpy of formation

Postby Tatiana Hage 2E » Tue Jan 23, 2018 11:51 am

The standard enthalpy change of formation of a compound is the enthalpy change which occurs when one mole of the compound is formed from its elements under standard conditions, and with everything in its standard state. However, the standard enthalpy change of a reaction is the enthalpy change which occurs when equation quantities of materials react under standard conditions, and with everything in its standard state.


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