Question 2 Gases are different from solids and liquids. In a sample of gas, the

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Question 2 Gases are different from solids and liquids. In a sample of gas, the molecules are far apart. The gas molecules also move around and collide with each other as well as with the walls of the container. These collisions generate pressure. The pressure of a gas can be measured in different units. One convenient unit of measure is called the atmosphere (atm) because it is based on atmospheric pressure. At sea level, the average pressure is 1 atm. As you get higher in altitude, the pressure steadily drops until you leave the atmosphere, where the pressure is very close to 0 atm. The table below shows the different commonly used units of measuring gas pressure. Use this table in the pressure unit conversions. Unit Abbreviation 1 atm equivalent atmosphere atm 1.00 atm (exact) millimeters of mercury mmHg 760 mmHg torr torr 760 torr in. Hg 29.9 in. Hg inches of mercury pounds per square lb/in.2 14.7 lb/in. inch (psi) Pa 101,325 Pa pascal Part A Convert 1.20 atm of pressure to its equivalent in millimeters of mercury. Express the pressure numerically in millimeters of mercury. mmHg 1.20 atm Submit Hints My Answers Give Up Review Part Part B The pressure in car tires is often measured in pounds per square inch (lb/in.2), with the recommended pressure being in the range of 25 to 45 lb/in Suppose a tire has a pressure of 28.0 lb/in Convert 28.0 lb/in. to its equivalent in atmospheres. Express the pressure numerically in atmospheres. 28.0 lb/in atm Submit Hints My Answers Give Up Review Part

Explanation / Answer

Answer – Part A) We are given pressure in atm and need to convert to mm Hg

We know

1 atm = 760 mm Hg

So, 1.20 atm = ?

= 912 mm Hg

Part B) We are given lb/in2 and need to convert atm

We know ,

1 lb/in2 = 0.0680 atm

28.0 lb/in2 = ?

= 1.905 atm

Part C) We are given pressure in Pascal and need to convert to torr.

We are given,

1 Pa = 0.00750 torr

3.43*108 Pa = ? torr

= 2.57*106 torr.

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