Three hundred gallons of a mixture containing 75.0 wt% ethanol (ethyl alcohol) and 25% water (mixture specific gravity 0.877) and a quantity of a 40.0 wt% ethanol-60% water mixture (SG 0.952) are blended to produce a mixture containing 60.0 wt% ethanol. Calculate the required volume of the 40% mixture (V40). 300gal m (lb) 0.750lbC,H,OH /lb 0250lb H,O/ lbm m, (Ib) 0.600 lb C,H,OH/ lb, 0.400 lb H,0/lb. Vo (gal) m (lb) 0.400 lb „C,H,OH/ Ib, 0.600 lb H,0/ lb

Calculate density in the following cases : (a) Air (ideal gas) at temperature 0°C and pressure 2 atm (b) Helium (ideal gas) that fills a 10-m³ volume at temperature 25°C, whose gauge pressure reads 1.5 atm (c) Granular iron of spherical grains of average diameter D = 1mm packed in a 1-grain/mm3 arrangement (density of iron p = 9g/cm³). Assume that the void in each mm3 is filled with air. Discuss why the result is expected. Make the same computation if the average diameter of the spherical grains are D = 0.25 mm packed in a 64-grain/mm3 . Discuss why the result for the density of both arrangements is the same.

Calculate the freezing point of a 2.0m solution of NaCl in water? Remember that NaCl is an electrolyte. The normal freezing point of pure water is 0.00°C. Kf(water) =1.86°C/m

Calculate the number of moles and the mass of the solute in 10.5 L of 3.716 M (NH4)2SO4, a liquid fertilizer.