• We’re currently investigating an issue related to the forum theme and styling that is impacting page layout and visual formatting. The problem has been identified, and we are actively working on a resolution. There is no impact to user data or functionality, this is strictly a front-end display issue. We’ll post an update once the fix has been deployed. Thanks for your patience while we get this sorted.

Enthalpy question

Hfg is the energy required to go from a saturated liquid to a saturated vapor... that's all we've used in thermo class. 😛

Ok, I googled it; first link said the heat of formation is the energy produced or consumed in a reaction, so since combustion is reaction, it makes sense that the heat of combustion is the heat of formation for a combustion reaction.
 
Heat of formation and heat of combustion are not the same. Heat of formation is the energy input necessary to form a given compound from its component elements (or, if a diatomic gas is a constituent, its natural molecular form such as O2). The heat of combustion is the energy of reaction when the compound is reacted with oxygen only.
 
no, i think it is opposite for specific reactions where the combustion is transforming the compound into it's natural states.
C +O2 -> CO2 heat of combustion is the heat of reaction, or enthalpy of CO2 - enthalpy of C -enthalpy of O2
heat of formation of CO2 is the same
 
You must log in or register to reply here.

TRENDING THREADS

Back
Top