jas114 asked:


I have a 200mL bottle of water that has been contaminated with ethanol. The concentration of ethanol is 390000 mg/L. What is the percentage of the bottle that is ethanol and how many parts per million of ethanol are in the bottle?

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1 Comment so far

1. luminolic73 June 18, 2009 2:39 pm

   Percentage and parts per million are dimensionless quantities. Assuming a solution density of 1g/mL, the ethanol percentage is calculated as follows:
   390000 mg/L * 1L/1000mL * 1g/1000mg * 1g/mL= 0.39g/g
   Multiply the above dimensionless result by 100% for the percentage (39%), or multiply the result by 10^6 ppm for the parts per million (390000 ppm).

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