PLEASE HELP ME! When magnesium powder is heated, it combines with oxygen to form white magnesium oxide powder.

(a) State one use of magnesium oxide.

(b) Write the chemical equation of this reaction.

(c) Calculate the mass of magnesium oxide formed if 3g magnesium is completely burnt in excess oxygen.

(d) The magnesium oxide is basic and reacts with hydrochloric acid to form magnesium chloride salt and water. Write the chemical equation of this reaction. (Relative atomic mass of O=16,Mg=24) ​

)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.