## Types of enthalpy

Valeria Viera 1B
Posts: 60
Joined: Fri Apr 06, 2018 11:05 am

### Types of enthalpy

What is the difference between $\Delta H$ and standard enthalpy of formation $\Delta H_f$° ?

How do we know which to use?

mahika_nayak_3L
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am

### Re: Types of enthalpy

Standard enthalpy refers to when all reactants and products are in their standard state at 1 atm or 1 M. For an element, it is the most stable phase at 25°C. Most reactions are given in standard state. If the bond enthalpies aren't given then you should calculate standard enthalpy of the reaction.

Amy Dinh 1A
Posts: 62
Joined: Fri Sep 28, 2018 12:23 am

### Re: Types of enthalpy

Standard enthalpy of formation is the standard reaction enthalpy for the formation of 1 mole of substance from its elements in their most stable form and is measured in units of kJ/moles

Return to “Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)”

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