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Enthalpy and States

Posted: Thu Jan 24, 2019 4:41 pm
by Tamera Scott 1G
Does the state of matter affect the enthalpy?

Re: Enthalpy and States

Posted: Thu Jan 24, 2019 4:58 pm
by Rhay Flores 4K
Enthalpy is heat absorbed or released at a constant pressure. Also, enthalpy is a state property so its specific value would be dependent on its current state, specifically the final minus the initial.

Re: Enthalpy and States

Posted: Thu Jan 24, 2019 5:08 pm
by Kevin ODonnell 2B
Yes the state of matter will affect the enthalpy. A liquid of a substance will have a different enthalpy than a gas of the same substance.

Re: Enthalpy and States

Posted: Thu Jan 24, 2019 5:50 pm
by Kyither Min 2K
Yup! Enthalpy is related to states and the enthalpy change of one state will be different than the enthalpy change of a different state.

Re: Enthalpy and States

Posted: Thu Jan 24, 2019 7:37 pm
by Eric Quach 1C
State of matter does affect enthalpy. The value of enthalpy between liquid water and vapor will be different.

Re: Enthalpy and States

Posted: Thu Jan 24, 2019 8:27 pm
by LedaKnowles2E
The enthalpy of a substance in its gaseous form > enthalpy in liquid form > enthalpy in solid form.
This is because heat is required to change a substance from solid to liquid, and liquid to gas.

Re: Enthalpy and States

Posted: Fri Jan 25, 2019 10:43 pm
by Riley Dean 2D
Yes, when calculating net enthalpy change, you will have to take into account enthalpy changes between states of matter

Re: Enthalpy and States

Posted: Sat Jan 26, 2019 11:55 am
by Aleeque Marselian 1A
Yes the state of matter will definitely affect enthalpy because different amounts of heat are required to change a substance through each phase.

Re: Enthalpy and States

Posted: Sat Jan 26, 2019 5:26 pm
by KHuang1L
State does affect enthalpy. That is why you need to add the enthalpy of the phase change for reactions where there is a phase change.