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Topic: Gas Law Lab----Help  (Read 4463 times)

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Offline sillygirl

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Gas Law Lab----Help
« on: May 21, 2009, 10:16:12 PM »
How do you do this question, I can not come up with the answer:

Find the mass in grams of a 240 ml sample of dry air at a pressure of 750 mmHg and a temperature of 19 degrees celsius. 
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Offline Acid_Guru

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Re: Gas Law Lab----Help
« Reply #1 on: May 21, 2009, 11:00:58 PM »
Use PV=NRT, so you get ((750/760)*(240/1000))=    N
                                 --------------------
                                      (.0821*292)

Find N

Then N*28.97(molar mass of air) is your answer, I got 0.286 grams (3 significant figures) for my answer.
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