Consider the reaction for recovering trace gold when mining: -------Au+---------

Question

Consider the reaction for recovering trace gold when mining:

-------Au+---------NaCN+------------O2+----------H2O-------NaAu (CN)2+----------------NaOH

a)Balance the reaction

b)What is the molecular mass of sodium cyanide (NaCM)?

c)How many sodium hydroxide molecules are generated when four atoms of gold (Au) react?

d)If you used 2 moles of O2 when the reaction is complete, how many moles of sodium hydroxide ( NaOH ) did you generate?

e)If four moles of O2 reacted, how many grams of gold reacted with it?

Explanation / Answer

a) 4Au+8NaCN+O2+2H2O4NaAu (CN)2+4NaOH

b) molecular mass of NaCN =(23+26)=49g/mol

c) 4 molecules

d) 8 moles

e) 16 moles

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