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 Post subject: when getting mass ratio of Zn to iodine, multiply I by 2?Posted: Tue, 25 Sep 2007 03:11:34 UTC
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Joined: Sun, 9 Oct 2005 22:53:32 UTC
Posts: 79
when calculating the mass ratio of Zn to iodine, do you multiply Iodine's atomic mass by 2?

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 Post subject: Posted: Tue, 25 Sep 2007 14:25:35 UTC
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Joined: Sun, 28 Jan 2007 14:32:18 UTC
Posts: 67
Location: London, UK
wouldnt it just be

(RMM of Zinc)/(RMM of Iodine)

so

65.4/126.9

= 0.516 (3sf)

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 Post subject: Posted: Tue, 25 Sep 2007 15:18:54 UTC

Joined: Thu, 15 Feb 2007 06:35:15 UTC
Posts: 755
it is true that Iodine is diatomic... but what is it that you mean by calculating the mass ratio? usually you do that when theyre in a solution?

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 Post subject: Posted: Wed, 26 Sep 2007 03:41:56 UTC
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Joined: Sun, 9 Oct 2005 22:53:32 UTC
Posts: 79
I did a reaction of Zn and Iodine with Zn left over.
I got the mass of iodine consumed and the mass of zinc consumed in the reaction and now I have to calculate the mass ratio of zinc to iodine in ZnI2.
My real question I guess is do i do
mass zinc/mass iodine OR mass zinc/2(mass iodine) which I guess now probably would be the first choice without multiplying by 2 because everything was taken care of as I did the experiment(it would multiply itself out in the reaction)

However, assuming I'm right above, I have another problem, far greater!
calculate the mass ratio of zinc to iodine in ZnI2 based on the chemical formula and knowledge of atomic masses.
Now this is where I'm completely halted and can't figure out wether I should be multiplying the mass of iodine by 2 or not.

If anyone one of you would be able to help me, I am forever grateful.

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 Post subject: Posted: Wed, 26 Sep 2007 03:54:21 UTC

Joined: Thu, 15 Feb 2007 06:35:15 UTC
Posts: 755
having two molecules of iodine means having twice the mass...

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 Post subject: Posted: Wed, 26 Sep 2007 04:05:06 UTC
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Joined: Sun, 9 Oct 2005 22:53:32 UTC
Posts: 79
so to confirm, I should not multiply mass of iodone consumed in Rxn by 2,
but should multiply the mass of iodine by 2 when calculating the mass ratio of zinc to iodine with the atomic masses from a periodic table???
THank you once again for your help and I await your response.

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 Post subject: Posted: Wed, 26 Sep 2007 17:38:09 UTC

Joined: Thu, 15 Feb 2007 06:35:15 UTC
Posts: 755
id say so

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 Post subject: Posted: Wed, 26 Sep 2007 19:38:20 UTC
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Joined: Tue, 6 Feb 2007 15:49:02 UTC
Posts: 2594
Hmm . . . zinc and iodine . . . sounds moderately exothermic . . . how did you start the reaction, and what happened?

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 Post subject: Posted: Wed, 26 Sep 2007 23:43:08 UTC
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Joined: Sun, 9 Oct 2005 22:53:32 UTC
Posts: 79
I started the reaction with pouring acetic acid in slowly and watched purple fumes come out and BTW, it was very hot so yes it was exothermic!

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 Post subject: Posted: Thu, 27 Sep 2007 05:17:34 UTC
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Joined: Tue, 6 Feb 2007 15:49:02 UTC
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Pouring acetic acid into what?

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 Post subject: Posted: Sun, 30 Sep 2007 01:07:08 UTC
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Joined: Sun, 9 Oct 2005 22:53:32 UTC
Posts: 79
a test tube with solid zinc and iodine in it

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