constant p

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ursulavictorino1K
Posts: 55
Joined: Sun Feb 17, 2019 12:15 am

constant p

Postby ursulavictorino1K » Sun Feb 09, 2020 9:13 pm

What does it mean if qp= deltaH?

peteryim
Posts: 54
Joined: Sat Sep 07, 2019 12:17 am

Re: constant p

Postby peteryim » Sun Feb 09, 2020 9:14 pm

This is the equation for change in enthalpy at constant pressure. At constant pressure, delta H is equal to the heat.

205007651
Posts: 53
Joined: Tue Nov 13, 2018 12:17 am

Re: constant p

Postby 205007651 » Sun Feb 09, 2020 9:15 pm

Enthalpy (which equals H) is amount of heat released divided by what is absorbed(at constant pressure)

Sidharth D 1E
Posts: 98
Joined: Sat Aug 24, 2019 12:17 am

Re: constant p

Postby Sidharth D 1E » Sun Feb 09, 2020 9:49 pm

It means that a change in the enthalpy of a system is equal to the heat released or absorbed at constant pressure. Since the external pressure is equivalent to the pressure of the system:
deltaH = q - P(deltaV) + P(deltaV), so deltaH equals q.

kausalya_1k
Posts: 50
Joined: Wed Nov 14, 2018 12:23 am

Re: constant p

Postby kausalya_1k » Sun Feb 09, 2020 11:33 pm

the definition of enthalpy is heat at constant pressure, so enthalpy (delta H) is the same as heat (q), which is why in an isobaric problem you can use q=deltaH


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