Part A Convert 0.650 atm of pressure to its equivalent in millimeters of mercury

Question

Part A

Convert 0.650 atm of pressure to its equivalent in millimeters of mercury.

Express the pressure numerically in millimeters of mercury.

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.2. Suppose a tire has a pressure of 43.0 lb/in.2 . Convert 43.0 lb/in.2 to its equivalent in atmospheres.

Express the pressure numerically in atmospheres.

Part C

High-pressure liquid chromatography (HPLC) is a method used in chemistry and biochemistry to purify chemical substances. The pressures used in this procedure range from around 500 kilopascals (500,000 Pa) to about 60,000 kPa (60,000,000 Pa). It is often convenient to know the pressure in torr. If an HPLC procedure is running at a pressure of 2.71×108 Pa , what is its running pressure in torr?

Express the pressure numerically in torr.

Explanation / Answer

1.

760 mm Hg= density of mercuty* g(9.8)* height of mercuty = (760/1000)m**9.8 m/sec2*13600 kg/m3 = 101293 N/m2, 1 atm =101.3 KN/m2= 101.3 Kpa

hence 1 atm = 760 mm Hg

1 atm = 760 mm Hg

0.650 atm = 0.650*760 mm Hg = 494 mm Hg

2. 14.7 lb/in2 = 1 atm

43 lb/inch2= 43*1/14.7 atm =2.93 atm

7. 760 torr= 1 atm and 1 atm= 101.325 Kpa= 101.325*1000 pa

hence 101.325*1000 pa = 760 torr

2.71*108 pa equals 2.71*108*760/ (101.325*1000)= 2032667.2 Torr

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