The number of molecules of a chemical that is equal to its molecular weight in grams, is a(n) ?

Why is permeable soil best for plants that need a lot of drainage?

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

)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.