226ChapterFiveGases37. A sealed-tube manometer (as shown below) can be used to mea-sure pressures below atmospheric pressure. The tube above themercury is evacuated. When there is a vacuum in the flask, themercury levels in both arms of the U-tube are equal. If agaseoussample is introduced into the flask, the mercury levels are dif-ferent. The differencehis a measure of the pressure of the gasinside the flask. Ifhis equal to 6.5 ern, calculate the pressure inthe flask in torr, pascals, and atmospheres.~\li38. 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 areequal. 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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