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Evaluating the work(w) of a system

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At constant pressure, which of these systems do work on the surroundings?

1. 2A(g) + 3B(g) -> 4C(g)
2. 2A(g) + B(g) -> 4C(g)
3. 2A(g) + 2B(g) -> 3C(g)
4. 2A(g) + B(s) -> 3C(g)

Remember that a system that does work on the surroundings has a negative value for work (w).

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The expert examines evaluating the work(w) of a system.

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Reactions work on their surroundings when the volume of the system expands during the course of the reaction. In other words, if the system reduces the volume, there is no work done on ...

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