Homework Help: Chemistry

Posted by Dovahkiin on Saturday, February 19, 2011 at 3:37pm.

To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water.

4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) 4 NaAu(CN)2(aq) + 4 NaOH(aq)

(a) Determine the mass of gold that can be extracted if 21.4 g sodium cyanide is used.

If the mass of the ore from which the gold was extracted is 126.0 g, what percentage of the ore is gold?

Chemistry - DrBob222, Saturday, February 19, 2011 at 9:56pm
I can't tell the difference between reactants and products because you don't have an arrow to indicate the separation; however, you can work this by following the example here. Just follow the steps.
http://www.jiskha.com/science/chemistry/stoichiometry.html
GOLD DUST FOR SALE - BENSON IMO, Tuesday, January 17, 2012 at 4:52am
GOLD DUST FOR SALE

Dear Sir/ Madam,
We are small scale Gold miners here on the sub-region of West Africa. We have some huge

quantity of alluvial Gold Dust for sale at a considerable price of $30,500USD per kilo

which is below world market price, 22 carat and 92.05% purity. If you are interested, do

not hesitate to get back to us as soon as possible for us to give you our full co-operate

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Best Regards
MR BENSON IMO

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