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At constant pressure, which of these systems do work on the surroundings? Check all that apply....

At constant pressure, which of these systems do work on the surroundings? Check all that apply.

A(g)+ 2B(g)--->2C(g)

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

A(s)+2B(g)---->C(g)

2A(g)+2B(g)--->5C(g)

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