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college chemistry

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Manometers can use liquids other than mercury to measure small pressure differences. On a day when the barometric pressure is 761.7 torr, a water manometer, connected between the atmosphere and a glass bulb containing a sample of helium gas has a height difference of 26.1 cm, The water level is higher in the arm connected to the bulb. Calculate the pressure in the bulb (in torr).

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