Which one is not the partial pressure of oxygen in the lungs ?
Correct answer: D. 1 atm
- A. 0.1526 atm
- B. 116 mm of Hg
- C. 116 torr
- D. 1 atm
Explanation
A partial pressure is only the pressure contributed by one gas, so oxygen cannot have a partial pressure of 1 atm in the lungs because nitrogen and other gases are also present. The values 0.1526 atm, 116 mm Hg and 116 torr are equivalent because 1 mm Hg equals 1 torr. Students may choose c by treating torr and mm Hg as different units, but they are numerically equivalent here.
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About Standard Temperature and Pressure
Standard temperature and pressure provide reference conditions for gas calculations: 0°C or 273 K and, in the usual school convention, 1 atm pressure. Questions use these conditions to relate pressure, volume, temperature and amount of gas, including the molar volume of an ideal gas, about 22.4 dm³.
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