Why Enthalpy Changes Are Additive

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Linh Vo 2J
Posts: 61
Joined: Sat Apr 28, 2018 3:00 am

Why Enthalpy Changes Are Additive

Postby Linh Vo 2J » Mon Jan 28, 2019 11:38 am

Can someone explain “enthalpy changes are additive” to me and why this is so?

Yousif Jafar 1G
Posts: 59
Joined: Thu May 10, 2018 3:00 am

Re: Why Enthalpy Changes Are Additive

Postby Yousif Jafar 1G » Mon Jan 28, 2019 12:04 pm

it is because it is a state function so it can be added

Kirsty Star 2H
Posts: 48
Joined: Fri Sep 28, 2018 12:24 am

Re: Why Enthalpy Changes Are Additive

Postby Kirsty Star 2H » Mon Jan 28, 2019 12:16 pm

A state function is something that doesn't depend on the path taken to get to a certain state, but only depends on the initial and final states. Another state function is volume. For example, if a bucket first had 5 L of water, then someone added 3 L and then took away 6 L, you end up with 2 L, and the overall change in the beaker was that it lost 3 L of water, regardless of the fact that water was added then taken away. This shows how volume is additive, and so are enthalpies.

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