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Topic: Mass Percent of Pure Copper Extracted from Copper Ore  (Read 3081 times)

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Offline trixysenred

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Mass Percent of Pure Copper Extracted from Copper Ore
« on: September 25, 2011, 12:02:36 PM »
Hi all! Chemistry has always been my weakest subject and I have some confusion about a lab I did last week.

I extracted 4.223g of gangue and 5.600g of pure copper from 15.455g of copper ore. Now, I'm supposed to find the mass percent of the copper and the gangue that was in the copper ore, but I feel like I did something wrong. Aren't my numbers supposed to add up to 100%? They obviously don't.

For mass percent I'm doing the amount of substance over the amount of ore and multiplying by 100.

Any help would be greatly appreciated!
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Offline trixysenred

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Re: Mass Percent of Pure Copper Extracted from Copper Ore
« Reply #1 on: September 25, 2011, 12:31:11 PM »
No one? 12 Views and no responses? Sigh.
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Offline Borek

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Re: Mass Percent of Pure Copper Extracted from Copper Ore
« Reply #2 on: September 25, 2011, 05:22:49 PM »
No idea if they have to add to 100% - IMHO they don't have to. Some of the products in extraction process could be gaseous and they simply got lost.

Quote from: trixysenred on September 25, 2011, 12:02:36 PM
For mass percent I'm doing the amount of substance over the amount of ore and multiplying by 100.

Sounds correct.
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Offline fledarmus

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Re: Mass Percent of Pure Copper Extracted from Copper Ore
« Reply #3 on: September 27, 2011, 10:18:26 AM »
How did you separate them?
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Offline MichaelRon

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Re: Mass Percent of Pure Copper Extracted from Copper Ore
« Reply #4 on: September 28, 2011, 11:00:36 AM »
I think the number is right. You can't get pure Cu from ore as they exist as CuO or CuS. The rest of the substance, I guess, would be impurities, such as S, O or sand(SiO2).
Therefore, in this copper ore, the composition will be:
Cu 36.2%
Gangue 27.3%
Impurities 36.5%
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