A gas is confined in the manometer as shown below. The stopcock is then opened and the highest level of mercury inside the tube moved to a level that is 80 $m m$ above its lowest level. What is the pressure of the gas?

m m H g

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160

m m H g

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680

m m H g

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840

m m H g

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Solution

The correct option is D 840 $m m H g$
The pressure of the gas is equal to the sum of the atmospheric pressure and the pressure due to the difference in the mercury level. The pressure of the gas $= 760 + 80 = 840 m m H g$ .

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A gas is confined in the manometer as shown below. The stopcock is then opened and the highest level of mercury inside the tube moved to a level that is 80 mm above its lowest level. What is the pressure of the gas?

The correct option is D 840 mmHgThe pressure of the gas is equal to the sum of the atmospheric pressure and the pressure due to the difference in the mercury level. The pressure of the gas =760+80=840mmHg.

A gas is confined in the manometer as shown below. The stopcock is then opened and the highest level of mercury inside the tube moved to a level that is 80 $m m$ above its lowest level. What is the pressure of the gas?

The correct option is D 840 $m m H g$
The pressure of the gas is equal to the sum of the atmospheric pressure and the pressure due to the difference in the mercury level. The pressure of the gas $= 760 + 80 = 840 m m H g$ .