Phase Change and Energy Absorbed

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Sarah Sharma 2J
Posts: 33
Joined: Fri Sep 29, 2017 7:05 am

Phase Change and Energy Absorbed

Postby Sarah Sharma 2J » Fri Jan 19, 2018 10:36 am

Can someone please explain to me why when calculating for a phase change and finding the energy released/absorbed we add MC(Delta)T to M(Delta)H and set them both equal to q? Thank you!

MorganYun1H
Posts: 59
Joined: Thu Jul 13, 2017 3:00 am

Re: Phase Change and Energy Absorbed

Postby MorganYun1H » Fri Jan 19, 2018 10:51 am

Because it requires a certain amount of energy to get through the phase change itself, you have to use m(Delta)H. Then after the substance has changed phases you have to use mC(delta)T to find the q. You add them together because that is the total q for the substance to get through the phase change and then the energy to get to the certain temp in the new phase change.


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