tailieunhanh - Chemistry part 19, Julia Burdge,2e (2009)

Tham khảo sách 'chemistry part 19, julia burdge,2e (2009)', khoa học tự nhiên, hoá học phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 448 CHAPTER 11 Gases n 1 s The Garrow Bag earned the praises even of Sir Edmund Hillary leader of the first expedition to the summit of Mount Everest. Gamow Bag Scuba divers are not the only athletes who can suffer the detrimental effects of sudden changes in pressure. Mountain climbers too are susceptible to the dangers of rapid ascent. At high elevation air pressure is significantly lower than at sea level. A lower total pressure means a lower partial pressure of oxygen and insufficient oxygen or hypoxia can cause altitude sickness. Early symptoms of altitude sickness include headache dizziness. and nausea. In severe cases climbers may suffer hallucinations seizure coma and even death. In 1990 Igor Gamow a professor of microbiology at the University of Colorado patented a portable device for high-altitude treatment of altitude sickness. The Gamow Bag is an inflatable cylinder large enough to accommodate an adult mountain climber. The bag is inflated and pressurized with a foot pump and the afflicted climber remains sealed inside the pressurized bag until symptoms subside enough to begin descent. Although the bag is pressurized to only about atm above atmospheric pressure at very high altitudes this corresponds to a simulated descent on the order of 10 000 ft Problems a If a Gamow Bag is pressurized to atm above atmospheric pressure at an altitude of 25 000 ft where atmospheric pressure is atm what height column of mercury would be supported by the pressure inside the pressurized bag b The Gamow Bag inflates to a volume of X IO2 L. What volume would be occupied by the air in the pressurized bag in part a at standard atmospheric pressure Assume no change in temperature. H Sample Problem c Calculate the density of the air in the pressurized bag in part a at 0 C. Assume that air is 80 percent N and 20 percent O2 by volume. I K Sample Problem d LiOH scrubbers are sometimes used to prevent the buildup of CO during use of the bag. What volume of

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• developed at the Department of Chemistry
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• Chulalongkorn University in Thailand
• This Small Lab Kit was created as a result of the research project entitled “Chemistry Laboratory Based on Chemical Safety and Pollution Minimization” sponsored by Thai Research Fund (RDG 3 07 2543)
• One of the outcomes of this project is the organic laboratory book entitled “Organic Chemistry Laboratory Based on Chemical Safety and Pollution Minimization” written in Thai by professors from 7 universities in this project
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