Why Is Q Equal to Delta H?

Sophia Al-Mansoor
Sophia Al-Mansoor
• • 6 min read

Enthalpy Is a State Function State Function State Functions Are Values That Depend on the State of the Substance, and Not on How That State Was Reached. for...

Why Is Q Equal to Delta H?

Enthalpy is a state function

state function
State functions are values that depend on the state of the substance, and not on how that state was reached. For example, density is a state function, because a substance's density is not affected by how the substance is obtained.
. ... If there is no non-expansion work on the system and the pressure is still constant, then the change in enthalpy will equal the heat consumed or released by the system (q). ΔH=q. This relationship can help to determine whether a reaction is endothermic or exothermic.

Why does Q equal delta H?

Enthalpy is a state function. ... If there is no non-expansion work on the system and the pressure is still constant, then the change in enthalpy will equal the heat consumed or released by the system (q). ΔH=q. This relationship can help to determine whether a reaction is endothermic or exothermic.

Must Read

Under what circumstances are Q and Δh the same?

(4) ΔH = q whenever a process is carried out at constant pressure and no work is done other than work of expansion. ΔE = q when a process is carried out at constant volume, and this is not an impossible or impractical experiment for many systems.

Sophia Al-Mansoor

Sophia Al-Mansoor

Global Business & E-Commerce Reporter
Linkedin Twitter

Sophia analyzes international trade, startup ecosystems, retail transformation, and supply chain logistics for modern digital publications.