Element x reacts with iron to form two different compounds with the formulas fex and fe2x3.
to which group on the periodic table does element x belong?
(1) group 8 (3) group 13
(2) group 2 (4) group 16

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?

In which situation can a mixture always be called a 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.