Answer the following questions about bec2 h2o(s) → bec2o4 (s) + 3 h2o(g) if 3.21 g of bec2 anhydrous beryllium oxalate is leftover? o4 (s) and its hydrate. (a) calculate the mass percent of carbon in the hydrated form of the solid that has the formula bec2 heated to 220.°c, bec2 o4 • 3 h2o(s) dehydrates completely as represented below. bec2 o4 • 3 h2o(s) is heated to 220 c, how much o4 • 3h2o (b) when o4 •

)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.