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The local composition models of chapter 13 share common features covered in this screencasts. An understanding of these principles will make all the algebra in the models less daunting.

Comprehension Questions:

1. In the picture of molecules given in the presentation on slide 2, what is the numerical value of the local composition x_{11}? 2. In the same picture, what is overall composition x_{1}? 3. What value of Ω_{21} can you infer from 1 and 2 above and the equations on slide 3?

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## Local Composition Concepts (6:51)

Local Composition Concepts (6:51) (msu.edu)

The local composition models of chapter 13 share common features covered in this screencasts. An understanding of these principles will make all the algebra in the models less daunting.

Comprehension Questions:

1. In the picture of molecules given in the presentation on slide 2, what is the numerical value of the local composition

x_{11}?2. In the same picture, what is overall composition

x_{1}?3. What value of Ω

_{21}can you infer from 1 and 2 above and the equations on slide 3?