Problem: 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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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 

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Problem Details

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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