C12H22O11(s) + O2(g) ---> CO2(g) +H2O(l)
Given this equation how would we be able to tell what happens to entropy?
How to tell what happens to entropy by seeing a reaction?
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Re: How to tell what happens to entropy by seeing a reaction?
Normally, combustion reactions result in an increase in entropy. Based on the phase changes, we see that a solid changed into a gas and liquid, which means an increase in entropy.
Re: How to tell what happens to entropy by seeing a reaction?
You can just generally look at the phase of the phase of the reactants and products. In this reaction, the reactants are 1 solid and 1 gas, while the products are 1 liquid and 1 gas. Because liquid has higher entropy than solid, the entropy of the products is higher.
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Re: How to tell what happens to entropy by seeing a reaction?
Like mentioned above, since the entropy of the products is higher, the total entropy would be a positive value.
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Re: How to tell what happens to entropy by seeing a reaction?
Generally speaking, the entropy for gas > liquid > solid.
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Re: How to tell what happens to entropy by seeing a reaction?
The phase of the reactants and products are the best way of looking at a reaction and determining how entropy changes, and entropy increases from solid to liquid to gas
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Re: How to tell what happens to entropy by seeing a reaction?
This youtube does a really good job of explaining how to predict changes in entropy: https://www.youtube.com/watch?v=ro3AnXdajAM
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