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At constant pressure, which of these systems do work on the surroundings? Check all that apply. A(s) + 2B(g) ---> C(g) 2A(g) + B(g) ---> 4C(g) A(g) + 2B(g) ---> 2C(g) A(s) + B(s) ---> C(g)

Karen Wright

in Chemistry

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1 answer

Craig Stewart on March 12, 2018

I think that the correct answer of the options listed above are the second and the last option. At constant pressure, the systems 2A(g) + B(g) ---> 4C(g) and 2C(g) To(s) + B(s) ---> C(g) produces work to the surrounding area. When a gas is evolved during a chemical reaction, the gas can be thought of as displacing the atmosphere - it pushes back against the air pressure. The work done, therefore V*P, where V is the volume of gas evolved, and P is the atmospheric pressure.

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