Which is "more ordered"? (9.37)

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Nivi Ahlawat 3I
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Joined: Fri Sep 25, 2015 3:00 am

Which is "more ordered"? (9.37)

Postby Nivi Ahlawat 3I » Tue Jan 26, 2016 3:32 pm

For HW 9.37 part d, the answer key says the 4 moles of solid products are more ordered than the 4 moles of solid reactants. The reaction is 4KCLO3(s) --> 3KCLO4(s) + KCL(s). Why is this the case?

Ronald Yang 2F
Posts: 86
Joined: Fri Sep 25, 2015 3:00 am

Re: Which is "more ordered"? (9.37)

Postby Ronald Yang 2F » Tue Jan 26, 2016 3:44 pm

Like the explanation says, "It is not immediately obvious." It is after you calculate the entropy change of the reaction and yield a negative value. This means that the sum of the absolute entropies of products minus the sum of the absolute entropies of reactants equals a negative value, meaning that the sum of the absolute entropies of reactants is greater than the sum of the absolute entropies of products. Thus, the reactants have more disorder than the products, and as such, the products are more ordered than the reactants.


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