Samples of coarse aggregate from a stockpile are brought to the laboratory for determination of specific gravities. the following weighs are found: Mass of moist aggregate sample as brought to the laboratory: 5298 grams Mass of oven dried aggregate: 5216 grams Mass of aggregate submerged in water: 3295 grams Mass of SSD (saturated surface dry) aggregate: 5227 grams Determine the aggregate bulk dry specific gravity

)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.