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Author Topic: Problem of the week - 20/05/2013  (Read 8813 times)

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Borek

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Problem of the week - 20/05/2013
« on: May 20, 2013, 08:03:14 AM »

When a sample of a rose red, rare mineral is reacted with 115.8 mL of 0.1 molar HCl, number of mLs of produced carbon dioxide (measured at 0°C and 1 atm) is identical to the molar mass of produced chloride. Identify the metal, name the mineral.
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Schrödinger

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Re: Problem of the week - 20/05/2013
« Reply #1 on: May 23, 2013, 12:18:23 AM »

Pbonyg ; Fcunrebpbonygvgr
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delta609

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Re: Problem of the week - 20/05/2013
« Reply #2 on: May 26, 2013, 07:44:02 AM »

I think it's Rhodocrosite (MnCO3), but the calculations don't add up. 

MnCO3 + 2HCl  :rarrow: MnCl2 + CO2 + H2O

115.8 L of 0.1 molar HCl will produce .1289 mL CO2; whereas, the molar mass of MnCl2 is 125.9 g/mol. 
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Borek

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Re: Problem of the week - 20/05/2013
« Reply #3 on: May 26, 2013, 08:24:29 AM »

Calculations don't add up, because it is not the correct answer. But you are not that far.
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DrCMS

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Re: Problem of the week - 20/05/2013
« Reply #4 on: May 26, 2013, 08:55:28 AM »

Sphaerocobaltite?
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Borek

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Re: Problem of the week - 20/05/2013
« Reply #5 on: May 26, 2013, 09:58:33 AM »

Sphaerocobaltite?

Yes. But Schrödinger was first :)
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DrCMS

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Re: Problem of the week - 20/05/2013
« Reply #6 on: May 26, 2013, 09:05:59 PM »

Yes. But Schrödinger was first :)

Yes I see now with rot13
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