anonymous
  • anonymous
Which of the following changes has a decrease in entropy?
Chemistry
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
hg N2O4 (g) 2NO2 (g) 3O2 (g) + 2KCl (s) 2KClO3 (s) C2H5OH (l) + 3O2 (g) 2CO2 (g) + 3H2O (g) H2O (l) H2O (g)
Mani_Jha
  • Mani_Jha
Do you know what a decrease in entropy means?
anonymous
  • anonymous
Yes. It means that the amount of randomness decreases eighter by the movement or amount of moleues

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anonymous
  • anonymous
But its hard to tell from these equATIONS
Mani_Jha
  • Mani_Jha
Now, see if I lump two free molecules(which had a lot randomness) into a single molecule of more weight, which will have more entropy(randomness), the two free molecules, or the resultant single heavier molecule? Did you get my question?
anonymous
  • anonymous
Uhh. are you asking which would be heavier
anonymous
  • anonymous
I get what you're saying in the first half but when you asked it looks like you left out th word "what" so I couldn't really see what you are asking
Mani_Jha
  • Mani_Jha
No, I am asking which one will move more easily i.e which will have more randomness. Of course, the single molecules formed as a product will be heavier than either of the reactants.
anonymous
  • anonymous
Is it this one? 3O2 (g) + 2KCl (s) 2KClO3 (s)
Mani_Jha
  • Mani_Jha
Yes. Do you understand why? Two reactants combine to form a single product of more weight. This restricts movement.(It is difficult for a heavier particle to move). So, it has less entropy
anonymous
  • anonymous
OHhh I got ya. So if it decreases we are looking for more of a solid or a more combined molecule. And if it increases we are looking for more seperation. Is this right>
Mani_Jha
  • Mani_Jha
Yes, exactly.
anonymous
  • anonymous
one thing...Which of the following changes will always be true for a spontaneous reaction? Would this be 1deltaG
anonymous
  • anonymous
Im sorry -1deltaG
Mani_Jha
  • Mani_Jha
Yes, whenever Gibb's Free Energy is negative, the reaction is spontaneous. Because then the change in enthalpy is negative. This means that the products are more stable than the reactants.
anonymous
  • anonymous
And would boiling water be an example of an increase in entropy? or these filtering sand out of a sample of water synthesizing water from hydrogen and oxygen
Mani_Jha
  • Mani_Jha
Boiling water converts liquid water into gaseous water vapour. As the particles in a gas have more randomness, there is an increase in entropy. Synthesizing water from hydrogen and oxygen is again one case where two molecules lump together to form a heavier molecule. So what do you think?

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