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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.
To get the decimal equivalent of any fraction, simply divide the fraction's denominator-in this case 8 - into 100 (100 divided by 8). The result is 12.5. Place the decimal point in front of the resulting number, i.e. .125 and 3 1/8 converts to the decimal equivalent of 3.125.