For a certain reaction $\Delta H = -50$ kJ and $\Delta S = -100$ J/K find the temperature so that the reaction is spontaneous.

Calculate the enthalpy change of the reaction,
$\text{H}_2\text{(g)} + \text{Cl}_2\text{(g)} \rightarrow 2\text{HCl(g)}$
if bond energies (kJ mol$^{-1}$):
H–H = 436, Cl–Cl = 242, H–Cl = 431

A weak monobasic acid is 0.04 % dissociated in 0.25 M solution. What is pH of the solution?

What is the relationship between the degree of dissociation of a weak base and its concentration?