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Scan_Doc0134 - 226 Chapter Five Gases 37 A sealed-tube...

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226 Chapter Five Gases 37. A sealed-tube manometer (as shown below) can be used to mea- sure pressures below atmospheric pressure. The tube above the mercury is evacuated. When there is a vacuum in the flask, the mercury levels in both arms of the U-tube are equal. If agaseous sample is introduced into the flask, the mercury levels are dif- ferent. The difference h is a measure of the pressure of the gas inside the flask. If h is equal to 6.5 ern, calculate the pressure in the flask in torr, pascals, and atmospheres. ~\l i 38. If the sealed-tube manometer in Exercise 37 had aheight differ- ence of 20.0 inches between the mercury levels, what is the pres- sure in the flask in torr and atmospheres? 39. A diagram for an open-tube manometer is shown below. Atmosphere ~ If the flask is open to the atmosphere, the mercury levels are equal. For each of the following situations where a gas is con- tained in the flask, calculate the pressure in the flask in torr, at- mospheres, and pascals.
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