Question

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)

Solution: At constant pressure, which of these systems do work on the ...

To calculate work, we use the equation:

$w=\Delta n_{g}RT$

We must find the value for $\Delta n_{g}$ in each of the reactions in order to figure out if work will be positive or negative. REMEMBER: If work done is negative, it indicates that the work is done BY the system on the surroundings. Negative work reactions will be our answer.

We must calculate $\Delta n_{g}$ in each reaction. This represents the change in number of moles of the reaction. Use the equation:

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