Calculate the molarity of absolute ethanol (100 % v/v ethanol).  b) Leeuwin Estate Art Series Chardonnay 2011 has an alcohol content of 13.5% ethanol by volume (13.5% v/

Chemistry: Principles and Reactions
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Chapter14: Equilibria In Acid-base Solutions
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Solve the set of problems shown below with reference to the following information about ethanol.

  • Ethanol (C2H5OH): molar mass = 46.069 g/mol.
  • Density of absolute (100 % v/v) ethanol = 0.7893 g/mL.
  1. a) Calculate the molarity of absolute ethanol (100 % v/v ethanol). 
  2. b) Leeuwin Estate Art Series Chardonnay 2011 has an alcohol content of 13.5% ethanol by volume (13.5% v/v). Calculate the molarity of ethanol in this wine
  3. c) The legal limit for a driver’s blood alcohol in Australia is 50 mg of ethanol per 100 mL of blood (referred to as a blood alcohol content (BAC) of 0.05 %).

          What is the molarity of ethanol (in blood) in a person at this legal limit?       

  1. d) How much Leeuwin Estate Art Series Chardonnay could a 70 kg person drink and remain under the legal limit (≤ 0.05 %)? Give your answer as a volume in mL.

The blood alcohol content will be equivalent to the alcohol content in the total ‘water’ component of the human body.

Assume that a 70 kg person contains 42 L of ‘water’.

Ignore the metabolism, and assume the water content of the person remains constant.

  1. e) During a romantic candlelight dinner a 70 kg person drinks a bottle (750 mL) of Leeuwin Estate Art Series Chardonnay in the space of 3 hours (assume the individual starts drinking wine from the start of the dinner).

Ethanol is metabolised at a constant rate of 120 mg per hour per kg body weight, regardless of its concentration.

 

  • What is their blood alcohol content (mg/100 mL blood) at the end of the dinner?
  • How long will it take for their blood alcohol level to fall to the legal limit (0.05 %)?
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