Concept explainers
Interpretation:
The pressure in the flask of manometer should be determined in units of torr and atm when the manometer shows a reading of 20.0 inches.
Concept Introduction:
The manometer is a devise used measure the pressure of a gas. The pressure of gas is determined by the value of ‘h’ shown by the manometer. This ‘h’-value is added or subtracted with atmospheric pressure to determine the pressure of gas.
If the flask side mercury level is decreased after the filling of gas, then the ‘h’-value will be added to atmospheric pressure to get the pressure of gas.
Atmospheric pressure = 760 mm Hg /torr
The pressure equivalent of ‘h’ value is,
h = 1 inch = 25.4 mm Hg
Pressure of a substance can be stated in various units. The units of pressure are interconvertible. The relations between the units of pressure are,
- Since the unit mm Hg and the unit torr is used interchangeably.
1 mm Hg =1 torr
- Conversion of 1 torr into atm is,
1 mm Hg = 1760 atm

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Chapter 5 Solutions
Chemistry (Instructor's)
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