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Lets try to figure out how to use entropy values when it comes to pure substances. Entropy is just another property we have to deal with, just like enthalpy, or internal energy. Its calculated on charts for us to use. Here are some entropy values shown on a table. You can use these values, just like any other to solve problems. Lets go through the new equations youll need, and then review some old ones. To figure out the change in entropy with a specified mass, we can use this equation. This is the mass, this is the entropy of the 2nd state and this is the entropy of the first state. If we have to deal with saturated mixtures, then we can use this. Here, x is the quality. Just to recap, thats the ratio of mass of vapor to the total mass of a mixture. So if you have a mixture of saturated vapor and saturated liquid, it tells us the ratio between the two. To solve problems involving pure substances, you must remember these old equations. This one was for
