   # If the sealed-tube manometer in Exercise 39 had a height difference of 20.0 inches between the mercury levels, what is the pressure in the flask in torr and atmospheres? ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

#### Solutions

Chapter
Section ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 8, Problem 40E
Textbook Problem
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## If the sealed-tube manometer in Exercise 39 had a height difference of 20.0 inches between the mercury levels, what is the pressure in the flask in torr and atmospheres?

Interpretation Introduction

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=1inch=25.4mmHg

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.

1mmHg = 1torr

• Conversion of 1 torr into atm is,

1mmHg = 1760atm

### Explanation of Solution

Explanation

The given ‘h’ value for the gas in manometer is 20 inch. The picture of manometer shows the    flask side mercury level is decreased after the filling of gas.

Hence the equation for finding the pressure of gas is,

Atmospheric pressure+h(inmm)

That is,

= (760+508)mmHg [20inch=(20*25.4)mm =508mm]

= 1268mmHg

Relation between mm Hg with torr and atm is,

1mmHg

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