Problem: A sealed-tube manometer (as shown below) can be used to measure pressures below atmospheric pressure. The tubeabove 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 a gaseous sample is introduced into the flask, the mercury levels are different. The difference h is a measure of the pressure of the gas inside the flask. If h is equal to 6.5 cm, calculate the pressure in the flask in torr, pascals, and atmospheres.

🤓 Based on our data, we think this question is relevant for Professor Pelton's class at UMN.

FREE Expert Solution
  • cmHg can be directly converted to torr: 

  • 1 torr = 0.1 cm

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Problem Details

A sealed-tube manometer (as shown below) can be used to measure 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 a gaseous sample is introduced into the flask, the mercury levels are different. The difference h is a measure of the pressure of the gas inside the flask. If h is equal to 6.5 cm, calculate the pressure in the flask in torr, pascals, and atmospheres.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Manometer concept. You can view video lessons to learn Manometer. Or if you need more Manometer practice, you can also practice Manometer practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Pelton's class at UMN.

What textbook is this problem found in?

Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl 2nd Edition practice problems.