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Scan_Doc0042 - 36 Chapter One Chemical Foundations 85 A...

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36 Chapter One Chemical Foundations 85. A children's pain relief elixir contains 80. mg acetaminophen per 0.50 teaspoon. The dosage recommended for a child who weighs between 24 and 35 lb is 1.5 teaspoons. What is the range of acetaminophen dosages, expressed in mg acetaminophen/kg body weight, for children who weigh between 24 and 35 lb? 86. This year, like many past years, you begin to feel very sleepy after eating a large helping of Thanksgiving turkey. Some people attribute this sleepiness to presence of the amino acid tryptophan in turkey. Tryptophan can be used by the body to produce sero- tonin, which can calm the brain's activity and help to bring on sleep. a. What mass in grams of tryptophan is in a 0.25-lb serving of turkey (assume tryptophan accounts for 1.0% of the turkey mass)? b. What mass in grams of tryptophan is in 0.25 quart of milk (assume tryptophan accounts for 2.0% of milk by mass and that the density of milk is 1.04 kglL)? 87. In recent years, there has been a large push for an increase in the use of renewable resources to produce the energy we need to power our vehicles. One of the newer fuels that has become more widely available is a mixture of 85% ethanol and 15% gaso- line, E85. Despite being more environmentally friendly, one of the potential drawbacks
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