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Topic: Gas effusion question  (Read 2054 times)

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Offline supehr

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Gas effusion question
« on: May 15, 2014, 06:09:12 PM »
Have i done the following problem right?

rate N2/rate gas = (Mgas/MN2)1/2

(38/64s)2 = Mgas/28
Mgas = 9.87 (so I'm guessing it's beryllium)?
« Last Edit: May 15, 2014, 06:45:38 PM by supehr »
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Offline Borek

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Re: Gas effusion question
« Reply #1 on: May 16, 2014, 03:05:54 AM »
You are not asked about the identity.

Don't ignore the units. 9.87 g/mol looks OK to me.
« Last Edit: May 16, 2014, 05:59:06 AM by Borek »
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Offline mjc123

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Re: Gas effusion question
« Reply #2 on: May 16, 2014, 05:33:57 AM »
You are given the effusion time, not the rate. Time is proportional to 1/rate. It takes longer to effuse, so it must be heavier.
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Offline Borek

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Re: Gas effusion question
« Reply #3 on: May 16, 2014, 05:58:52 AM »
Sigh, you are right.
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Offline supehr

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Re: Gas effusion question
« Reply #4 on: May 16, 2014, 11:57:40 PM »
Oh i see what i was doing wrong thanks!
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