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Delta H v. q

Posted: Thu Jan 30, 2020 9:26 am
by LNgo 1G
What is the difference between delta H and q?

Re: Delta H v. q

Posted: Thu Jan 30, 2020 9:53 am
by Izzie Capra 2E
I believe that q is simply the heat that can be measured in a transfer. Enthalpy (delta H) is the total heat content in a system. It is energy, kind of like its potential energy RELATING to heat.

Re: Delta H v. q

Posted: Thu Jan 30, 2020 11:24 am
by Abby Soriano 1J
Do you know why or how delta H is equal to qp? What about the constant pressure makes the two equal?

Re: Delta H v. q

Posted: Thu Jan 30, 2020 11:35 am
by Angela Prince 1J
Delta H is equal to q only when the gas is at a constant pressure. By definition, enthalpy (deltaH) is the amount of heat released/absorbed at a CONSTANT PRESSURE, so the heat required to change temp of gas at a constant pressure is the same as enthalpy.

Re: Delta H v. q

Posted: Thu Jan 30, 2020 11:36 am
by Abby Soriano 1J
Angela Prince 1J wrote:Delta H is equal to q only when the gas is at a constant pressure. By definition, enthalpy (deltaH) is the amount of heat released/absorbed at a CONSTANT PRESSURE, so the heat required to change temp of gas at a constant pressure is the same as enthalpy.


So does that mean that the same does not hold for qv?

Re: Delta H v. q

Posted: Thu Jan 30, 2020 4:11 pm
by ValerieChavarin 4F
q refers to the energy, as heat, transferred due to a change in temperature. is the heat transferred at constant pressure