w = -PΔV
↑ v (volume expands) = ↓ w = – w → work is done by the system on the surroundings
↓ v (volume compresses) = ↑ w = + w → work is done on the system by the surroundings
At constant pressure, which of these systems do work on the surroundings? Check all that apply.
a. 2A(g)+3B(g) → 4C(g)
b. A(s)+B(g) → 2C(g)
c. A(g)+B(g) → 3C(g)
d. A(s)+2B(g) → C(g)
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