At the Fred Hutchison Cancer Research Center in Seattle it was discovered that mice can be put into a state of suspended animation by applying a low dose of hydrogen sulfide, H 2 S. The breathing rate of the mice fell from 120 to 10 breaths per minute and their temperature fell to just 2 °C above ambient temperature. Six hours later the mice were revived and seemed to show no negative effects. (a) Hydrogen sulfide is a gas at room temperature and normal atmospheric pressure whereas water is a liquid with a low vapor pressure under the same conditions. Explain this observation. (b) The H 2 S gas delivered to the mice had a concentration of 80 ppm. (A concentration of 1 ppm is 1 part per million, or one molecule in every 1 million molecules.) If you deliver 1.0 L of gas (a mixture of O 2 , N 2 , and H 2 S) at a total pressure of 725 mm Hg at a temperature of 22 °C, what is the partial pressure of the H 2 S gas? (c) Hydrogen sulfide can be converted to sulfuric acid. If 5.2 L of H 2 S gas at 130 mm Hg pressure and 25 °C is allowed to react with O 2 gas, how many liters of O 2 gas, also at 130 mm Hg pressure and 25 °C, are required for complete reaction? Assume the following reaction occurs. H 2 S(g) + 2 O 2 (g) → H 2 SO 4 ( ℓ )

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Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
BuyFind

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

Solutions

Chapter 11, Problem 52SCQ
Textbook Problem

At the Fred Hutchison Cancer Research Center in Seattle it was discovered that mice can be put into a state of suspended animation by applying a low dose of hydrogen sulfide, H2S. The breathing rate of the mice fell from 120 to 10 breaths per minute and their temperature fell to just 2 °C above ambient temperature. Six hours later the mice were revived and seemed to show no negative effects.

  1. (a) Hydrogen sulfide is a gas at room temperature and normal atmospheric pressure whereas water is a liquid with a low vapor pressure under the same conditions. Explain this observation.
  2. (b) The H2S gas delivered to the mice had a concentration of 80 ppm. (A concentration of 1 ppm is 1 part per million, or one molecule in every 1 million molecules.) If you deliver 1.0 L of gas (a mixture of O2, N2, and H2S) at a total pressure of 725 mm Hg at a temperature of 22 °C, what is the partial pressure of the H2S gas?
  3. (c) Hydrogen sulfide can be converted to sulfuric acid. If 5.2 L of H2S gas at 130 mm Hg pressure and 25 °C is allowed to react with O2 gas, how many liters of O2 gas, also at 130 mm Hg pressure and 25 °C, are required for complete reaction? Assume the following reaction occurs.

H2S(g) + 2 O2(g) → H2SO4()

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Chapter 11 Solutions

Chemistry & Chemical Reactivity
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