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November 07, 2025, 03:23:46 am
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Author Topic: Mikehepro's chem thread  (Read 770 times)  Share 

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mikehepro

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Mikehepro's chem thread
« on: August 12, 2013, 12:41:49 pm »
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Hey all. How do I approach this stoichimetry question?
Question 20 on the image.
All these information are confusing me.
Thanks
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jgoudie

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Re: Mikehepro's chem thread
« Reply #1 on: August 12, 2013, 06:05:31 pm »
+1
n(BaSO4) =m/Mr
               =9.32/233.3
               = 0.0399mol

All sulphate came from the copper(II) sulphate hydrate.

n(BaSO4) = n(CuSO4.5H20) = 0.0339
m(CuSO4.5H2O) = m.Mr
                          = 0.0339*249.54
                          = 9.97grams

mass silica = sample - copper(II) sulphate
                 = 16.63-9.97
                 = 6.70grams.

This seems a little high, but according to the calculations is correct.
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mikehepro

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Re: Mikehepro's chem thread
« Reply #2 on: August 12, 2013, 10:27:10 pm »
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Thank you very much jgoudie.
i got it now :) i thought the number i got was a bit too high too :)
Thanks again.
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