Manometer Readings

What is the pressure difference, in cm of water, shown by the manometer?

• 9

• 16

• 20

• 25

• A

• B

• C

• D

Pressure can be measure in cm of water.

What is the pressure of the gas?

• 8 cm of water more than atmospheric pressure

• 12 cm of water more than atmospheric pressure

• 8 cm of water less than atmospheric pressure

• 12 cm of water less than atmospheric pressure

• A

• B

• C

• D

What is the pressure of the sample of gas trapped in the open-tube mercury manometer shown below if atmospheric pressure is 736 mmHg and h = 9.2 cm?

• 92 mm Hg

• 736 mm Hg

• 745.2 mm Hg

• 828 mm Hg

What will happen to the height (h) of the mercury column in the manometer shown below if the stopcock is opened, given that the atmospheric pressure is 755 mmHg?

• h will decrease

• h will not change

• h will increase

• not enough information given to answer the question

Which gas has a greater pressure?

• air

• methane

• The gas pressures are equal

If the air pressure is 750 mmHg, what is the pressure of Gas B?

• 695 mmHg

• 805 mmHg

• 750 mmHg

• 55 mmHg

What is the pressure of gas C if the air pressure is 760?

• 1405 mmHg

• 645 mmHg

• 115 mmHg

A manometer is used to measure the pressure of an unknown gas. What is the Pressure of the unknown gas? (atmospheric pressure = 100 kPa, density of mercury = 13,600 kg/m³)

• 121.8 kPa

• 128.6 kPa

• 106.8 kPa

• 93.2 kPa