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Topic: why does N2 + 3 H2----> 2 NH3 + heat symbolize a decrease in entropy???  (Read 3452 times)

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Offline petstar21

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why does N2 + 3 H2----> 2 NH3 + heat symbolize a decrease in entropy???
« on: April 28, 2008, 07:17:42 PM »
i understand how its exothermic, but since they are all gases (no phase change) how do you know the entropy is deceasing??
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Offline Yggdrasil

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Re: why does N2 + 3 H2----> 2 NH3 + heat symbolize a decrease in entropy???
« Reply #1 on: April 28, 2008, 08:57:22 PM »
You have fewer particles on the right than on the left.
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Offline mnakhla

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Re: why does N2 + 3 H2----> 2 NH3 + heat symbolize a decrease in entropy???
« Reply #2 on: April 30, 2008, 09:59:39 AM »
you took 4 moles of gas and formed 2 moles of gas from it....less molecular chaos thereby lower entropy
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