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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.
4/5 as a decimal is 4 divided by 5. 4/5=.8. once you have decimal its easy to make a percentage. Theres an imaginary 0 behind the 8 so .80. .80 is 80 hundredth. 80% is your percentage OR. 4/5 multiply it through by 20. 4x20 is 80, 5x20=100. 80/100=80%.