The equilibrium constant is given for one of the reactions below. determine the value of the missing equilibrium constant.

h2(g) + br2(g) ⇌ 2 hbr(g) kc = 3.8 × 104
4 hbr(g) ⇌ 2 h2(g) + 2 br2(g) kc = ?

200. ml of 3.00 m nacl solution is diluted to a final volume of 500. ml. what is the molarity of the final solution?

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.

Which substance can be broken down by chemical means