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A company wishes to distill a 0.830 mole fraction ethanol (0.170 mole fraction water) solution. To aid in the distillation process, a 0.950 mole fraction benzene (0.050 mole fraction water) mixture containing fresh benzene and a recovered benzene solution is added.
Calculate the mass of HâPOâ. 1 L soln Ã #(13.0mol HâPOâ)/(1L soln) Ã (98.00g HâPOâ)/(1mol HâPOâ)# = 1274 g HâPOâ (3 significant figures + 1 guard digit) 3. Use the density to calculate the mass of the solution. 1000 mL soln Ã #(1.464g soln)/(1mL soln)# = 1464 g soln. 4. Calculate the percent concentration.