Practice Problem 4

Calculate the standard-state entropy of reaction for the following reactions and explain the sign of  deltaS for each reaction.

(a) Hg(lequilibr.gif (63 bytes) Hg(g)

(b) 2NO2(g) equilibr.gif (63 bytes) N2O4(g)

(c) N2(g) + O2(g) equilibr.gif (63 bytes) 2NO(g)


Answer

(a)    98.94 J/K, the sign of  deltaSo is positive.

(b)  -175.83 J/K, the sign of deltaSo is negative.

(c)     24.77 J/K, the sign of deltaSo for this reaction is small but positive.

1back.jpg (2079 bytes)

1solution.jpg (2261 bytes)