what is the entropy change?
915075
I don't have the constant for the change of steam to water.  But 373.15 is the boiling point of water.  So simply multiply 42.3 g/h20 by the constant for the conversion of steam to liquid and you will get it.
1116331
The third law of thermodynamics states that \n\nany system left on its own will advance to a state that is worse and more confused than the one it started at.
1135425
Your question is not specific!  There are so many "chemical changes", which one are you speaking of?  Sometimes, nothing happens, and, therefore, nothing is released!  Therefore, your question needs qualification!  Which chemical change?
524450
There is probably a fundamental connection between thought and entropy.  My reasons for speculating this are as follows: thought is a form of computation, and computation results in an increase in entropy.  In information theory there is a measure called Shannon's measure of entropy, this measurement is called entropy because of its similarities to thermodynamic measurements.  Landaeur also demonstrated that there is a connection between processing information and entropy.\n\nI'd like to comment on iMi's answer that thought is not physical.  I do think that is correct.  I think thought is a physical phenomenon.  First, I can demonstrate that through the thought process I can influence the physical realm.  Second, the physical realm through for example, the use of drugs, can alter my thoughts.  So there seems to be a two way street between what we recognize as thought and the physical realm, so I conclude that thought is a physical process.\n\nConcluding, thought is likely some sort of information processing, and since in general information processing is irreversible, thought has a fundamental relationship to entropy and the process involved in thought likely always increases entropy.
804468
You need to look up the entropy for all compounds, multiply by the entropy by the stochiometric coefficients (e.g. 4 for NH3, 3 for O2). Then subtract the left side from the right side.\n\nVery simple actually, once you find the data.
520018
Delta E is a term used to describe change in internal energy which is the sum total of the kinetic and potential energies of the constituent particles.Internal energy can be changed only by allowing heat to move in/out of the system or by work done on/by the system.It is often defined as the heat absorbed at constant volume. Heat change at constant pressure is what we call change in enthalpy or delta H.
1140369
First Law of Thermodynamics: Energy can be changed from one form to another, but it cannot be created or destroyed. The total amount of energy and matter in the Universe remains constant, merely changing from one form to another. The First Law of Thermodynamics (Conservation) states that energy is always conserved, it cannot be created or destroyed. In essence, energy can be converted from one form into another. Click here for another page (developed by Dr. John Pratte, Clayton State Univ., GA) covering thermodynamics.\n\nok now to answer your question:\nWork=PV=nRT\nWork=(2moles)(8.32)(106-21)\nWork=1414.4J
1000410
2nd Law of Thermodynamics....the irreversible trend toward equilibrium and total disorder.....its the law of the universe and nature.
1173332
Regard Schrodinger's equation (Hy=C.dy/dt) H is the energy operator and you will have the answer it's the ability to change, in fact its the change it self, even if you go around and around again. Even if the object are instantly changing and in average aspect does not change.
427277
Maybe you will find this article useful. It explains the concept of information entropy.
280701
The Second Law merely describes the observed data.  The lower entropy in the past is what is being described by the Second Law.\n\nScience cannot answer why things are as they are, but only can describe them and project into the future, based on the assumption that the future will be like the past.
494993
Entropy is a mathematical function the increase of which specifies the corresponding increase of disorder of a system. Since all physical changes are accompanied by losses of one sort or another, and since these losses bring about increasing disorder, then all processes are accompanied by an increase of entropy.\n\nFor this reason increase of entropy is often considered as a realistic measure of the passage of time.\n\nI don't know what you mean by 'energy dissipation by pressure of space'!
211421
It's in the second law of thermodynamics. It's the measurement of disorder in the universe. Every time a chemical or physical reaction happens, it increases the entrophy (disorder) in the universe.
1161882
I assume DH is delta H ? If so - it's the change in heat. Final minus initial.
792038
For the forward reaction (from left to right), there is a decrease in enthalpy, which indicates it will tend to proceed as written, to products.\nThe entropy increases from left to right (products are gaseous), and this also favours the forward reaction to proceed to products.
76006
well, it is possible to decrease entropy in a reaction.  if i cool some water down and it freezes, then my highly disordered liquid forms a highly ordered crystal, and the entropy of my water is lower.\n\nbut, you have to consider the statement of the second law, which is that the entropy of the *universe* is always increasing.  it costs you some energy to cool your water down - you have to run a freezer or something - and the production of this energy at some other point in the process comes with an increase in entropy that is greater than the decrease you get from freezing.\n\nas for an endothermic reaction, i am not sure which reaction you are speaking of.  so i will give a simple example of an endothermic reaction:\n\nH2O (l) -> H2O (g)\n\nwhen water evaporates, it cools its container and draws heat in.  however, this is accompanied by an increase in the entropy, since you go from a more-ordered (liquid) state to a less-ordered (gaseous) state.  \n\ntypically, an endothermic reaction will involve some kind of phase change, where for example you mix two solids together and you end up with a liquid and a solid.  here is an example of that:\nhttp://jchemed.chem.wisc.edu/JCESoft/CCA/CCA3/MAIN/ENDO2/PAGE1.HTM\n\nso, the random thermal energy is converted into useful ordered bond energy - this is a decrease in entropy.  but it comes at the expense of breaking *other* bonds and using their energy, and an overall increase in entropy of the system.
173191
Im learning about this in my science class. The first law of thermodynamics is that energy can be neither created nor destroyed. It can, however, be transferred from one place to another, and can be changed into a different form.