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Topic: Pressure of the gas sample in kiloPascals  (Read 6877 times)

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Offline cloverkissx3

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Pressure of the gas sample in kiloPascals
« on: October 22, 2009, 04:26:47 PM »


In the above manometer, attached to a sample of gas, the difference in the height of the mercury levels is 28.0mm. The barometric pressure is 750.0mm Hg. What is the pressure of the gas sample in kiloPascals ?
 ( The above figure is not drawn to scale, but the relative heights of the right and left columns of mercury are correctly shown )
 Enter a numeric answer only, no units.

I converted into :

99.992 kiloPascal, but it is incorrect. What did I do wrong? Please!! :)
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Offline Arctic-Nation

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Re: Pressure of the gas sample in kiloPascals
« Reply #1 on: October 22, 2009, 04:33:59 PM »
Please show us your calculations.
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Offline cloverkissx3

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Re: Pressure of the gas sample in kiloPascals
« Reply #2 on: October 22, 2009, 04:48:21 PM »
Quote from: Arctic-Nation on October 22, 2009, 04:33:59 PM
Please show us your calculations.

One millimeter of mercury (Hg) is equal to 133.322387415 Pascals, so just multiply 750.0mm Hg x 133.32238 = 99992.000
to kiloPascal = 99.992
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Offline Arctic-Nation

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Re: Pressure of the gas sample in kiloPascals
« Reply #3 on: October 22, 2009, 04:53:25 PM »
Um, okay, you first divided 100,000 Pascal by 750 mm mercury, and then multiplied the result again by 750 mm mercury. Can you see your error? ;)
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Offline Borek

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Re: Pressure of the gas sample in kiloPascals
« Reply #4 on: October 22, 2009, 05:34:31 PM »
You forgot to account for 28 mm.
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Offline miss.strw

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Re: Pressure of the gas sample in kiloPascals
« Reply #5 on: October 22, 2009, 06:11:13 PM »
Quote from: Borek on October 22, 2009, 05:34:31 PM
You forgot to account for 28 mm.

mm..i have the same problem! can someone show how to put in 28 mm???!!!
« Last Edit: October 22, 2009, 06:36:22 PM by miss.strw »
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Offline cloverkissx3

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Re: Pressure of the gas sample in kiloPascals
« Reply #6 on: October 22, 2009, 08:20:58 PM »
I don't know. Please give me some hints. thanks!
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Offline Borek

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Re: Pressure of the gas sample in kiloPascals
« Reply #7 on: October 23, 2009, 03:06:27 AM »
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Offline JGK

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Re: Pressure of the gas sample in kiloPascals
« Reply #8 on: October 23, 2009, 11:23:34 AM »
which is at the higher pressure, the gas in the vessel or the atmosphere?

How much higher?

answer those and you should have no trouble getting to the result
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