Consider these changes.
(a) hg(l)-> hg(g)
(b) 3o2(g)-> 2o3(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?

How does the value of the equilibrium constant show that a reaction reaches equilibrium very quickly? (a) the equilibrium constant is large. (b) the equilibrium constant is small. (c) the equilibrium constant is zero. (d) the value of the equilibrium constant does not show how quickly a reaction comes to equilibrium.