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Physical Chemistry

Cool goIITian

 Joined: 29 May 2012 Post: 32
18 Jul 2012 21:06:53 IST
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Engineering Entrance , Medical Entrance , NEET , JEE Main , AIIMS , JEE Main & Advanced , Chemistry , Physical Chemistry

a vessel of volume 100 ml contains 10% of oxygen and 90% of an unknown gas. the gases diffuse in 86 sec through a small hole of the vessel. if pure oxygen under the same conditions diffuses in 75 sec . what is the molecular mass of that unknown gas

i just needa simple xplanation..!

Blazing goIITian

Joined: 21 Mar 2012
Posts: 1457
18 Jul 2012 21:48:59 IST
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Blazing goIITian

Joined: 16 May 2012
Posts: 1495
19 Jul 2012 14:07:54 IST
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wats the ans??????????? i'm getting 52 approx.....

Cool goIITian

Joined: 29 May 2012
Posts: 32
19 Jul 2012 19:27:46 IST
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optionsa)40b)42C)43D)44

Blazing goIITian

Joined: 16 May 2012
Posts: 1495
19 Jul 2012 19:29:33 IST
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ok let me see....

Scorching goIITian

Joined: 17 Jul 2012
Posts: 254
19 Jul 2012 20:30:04 IST
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whats difficult in it??it will be 43.19 approx.

Scorching goIITian

Joined: 17 Jul 2012
Posts: 254
19 Jul 2012 20:36:24 IST
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let molecular weight of gas me M .then considering it M , get the mol weight of mixture=3.2+0.9Mthen simply get the rates of diffusion for O2 and the mixture..and compare using grahms law.

Scorching goIITian

Joined: 17 Jul 2012
Posts: 254
19 Jul 2012 20:53:58 IST
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let molecular weight of gas meM .then considering it M , get themol weight ofmixture=3.2+0.9Mthen simplyget the rates of diffusion for O2and the mixture..and compareusing grahms law.it will be 43.19

Cool goIITian

Joined: 29 May 2012
Posts: 32
19 Jul 2012 22:41:46 IST
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yeah kinda got it thank u..!

Blazing goIITian

Joined: 16 May 2012
Posts: 1495
19 Jul 2012 22:42:34 IST
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bloody hell........oh damn i made the error in calculation.......

Cool goIITian

Joined: 29 May 2012
Posts: 32
20 Jul 2012 19:29:54 IST
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its 42 ...!!

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