Homework 8.57

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Yeyang Zu 2J
Posts: 58
Joined: Fri Sep 29, 2017 7:06 am

Homework 8.57

Postby Yeyang Zu 2J » Thu Jan 25, 2018 11:38 pm

Why on the solution manuals
the answer use the sum of enthalpy of reactant to minus the sum of enthalpy of products???
or do i misunderstand the meaning of ∆Hc is it meaning the enthalpy of formation ???

David Minasyan 1C
Posts: 54
Joined: Thu Jul 13, 2017 3:00 am

Re: Homework 8.57

Postby David Minasyan 1C » Thu Jan 25, 2018 11:46 pm

It seems like the product and reactant enthalpies are negative. And if we're doing products minus reactants the reactants are now a positive value (-products - (-reactants) is the same as reactants - products). Hope that helps

Posts: 29
Joined: Fri Sep 29, 2017 7:05 am

Re: Homework 8.57

Postby andrewr2H » Fri Jan 26, 2018 12:32 am

The order in which you add values does not change the final sum. And when you apply a double negative to a value it becomes a positive value. Thus the equation can also be written as (reactants - products) instead of (-products + reactants).

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