Homework Help: Chemistry

Posted by Yasha on Friday, March 23, 2012 at 7:30pm.

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)

Chemistry - DrBob222, Friday, March 23, 2012 at 10:06pm
If # mol gets larger, that's an expansion, and the system does work on the surroundings. If # mol gets smaller, that's a decrease in volume, and the surroundings do work on the system.
Watch out for those solids. They are not gases and don't count when counting moles.
Chemistry - Yasha, Friday, March 23, 2012 at 10:46pm
Thank you so very much~! <3

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