Barometric pressure of 30.2 inches of mercury is reported by weather bureau. This corresponds to a pressure of:
Correct answer: C. 1.01 atm
- A. 754 torr
- B. 54.6 mm of water
- C. 1.01 atm
- D. 74.0 cm Hg
Explanation
1 inch of Hg = 2.54 cm of Hg 30.2 inches of Hg = 30.2 (2.54) cm of Hg = 30.2 (5.08/2) = 15.1(5.08) = 76.7 cm of Hg = 767 torr 760 torr = 1 atm 767 torr = (767/760) atm = 1.01 atm 1.36 cm Hg = 1 cm H2O 76.7 cm Hg = (76.7/1.36) cm H2O = 56.3 cm H2O = 563 mm H2O Thus; 30.2 inches of Hg = 767 cm Hg = 767 torr = 563 mm H2O = 1.01 atm So 1.01 atm is the correct option.
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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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