Consider these changes.(a) Hg(l) Hg(g)(b) 302(g) 203(g)(c) CuSO4 · 5H2O(s) CuSO4(S) + 5H...

Consider these changes.

(a) Hg(l) Hg(g)

(b) 302(g) 203(g)

(c) CuSO4 · 5H2O(s) CuSO4(S) + 5H2O(g)

(d) H2(g) + F2(g) 2HF(g)

At constant pressure, in which of the reactions is work done by the system on the surroundings? By the surroundings on the system? In which of them is no work done?