4) A manometer containing mercury is used to measure the gas pressure in a pipe.

Question

4) A manometer containing mercury is used to measure the gas pressure in a pipe. What is the gauge pressure of the gas in mm Hg?

1) A student filled a 1-L flask with ethanol (specific gravity = 0.79) in 20 s through a funneling spigot. The time to fill the same flask with water using the same mass flow rate would be ________.
A. shorter     
B. longer     
C. the same     


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2) A gas mixture has the following composition by mass (g species/g total):

     O2 20%;

     CO 30%;

     CO2 35%;

     H2 15%.

Which has the highest molar fraction?
A.O2     
B.CO     
C.CO2     
D.H2     

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3) Which statements are true?

1) An open-end manometer provides a direct reading of the gauge pressure of a fluid.

2) A sealed-end manometer provides a direct reading of the absolute pressure of a fluid, provided that the fluid pressure in the sealed end may be neglected.

3) The reading of a differential manometer does not depend on the density of fluid in the pipeline but only on that of the manometer fluid.
A.1 & 3     
B.3     
C.1 & 2     
D.2     
E.1, 2 & 3

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4) A manometer containing mercury is used to measure the gas pressure in a pipe. What is the gauge pressure of the gas in mm Hg?

  A.10
  B.30
  C.50
  D.80

A student filled a 1-L flask with ethanol (specific gravity = 0.79) in 20 s through a funneling spigot. The time to fill the same flask with water using the same mass flow rate would be shorter longer the same A gas mixture has the following composition by mass (g species/g total) O2 20%; CO 30%; CO2 35%; H2 15%. Which has the highest molar fraction? O2 CO CO2 .H2 Which statements are true? An open-end manometer provides a direct reading of the gauge pressure of a fluid. A sealed-end manometer provides a direct reading of the absolute pressure of a fluid, provided that the fluid pressure in the sealed end may be neglected. The reading of a differential manometer does not depend on the density of fluid in the pipeline but only on that of the manometer fluid. 1 & 3 3 1 & 2 2 1, 2 & 3 A manometer containing mercury is used to measure the gas pressure in a pipe. What is the gauge pressure of the gas in mm Hg? 10 30 50 80

Explanation / Answer

1)

A. shorter

2)

D.H2

mole fraction

O2 20%; 20/16 = 1.25

CO 30%; 30/28 = 1.07

CO2 35%; 35/44= 0.79

H2 15%. 15/1=15

3)

E.1, 2 & 3

4)

C.50

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