Problem: Gold is isolated from rocks by reaction with aqueous cyanide, CN-: 4 Au(s) + 8 NaCN(aq) + O2(g) + H2O(l)  →  4 Na[Au(CN)2](aq) + 4 NaOH(aq)How many liters of a 0.200 M sodium cyanide solution would be needed to react with 45.0 kg of rocks that contain 2.00% by mass of gold?

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Step 1. Find the mass of Au

210045 kg = 0.9 kg

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Gold is isolated from rocks by reaction with aqueous cyanide, CN-: 4 Au(s) + 8 NaCN(aq) + O2(g) + H2O(l)  →  4 Na[Au(CN)2](aq) + 4 NaOH(aq)

How many liters of a 0.200 M sodium cyanide solution would be needed to react with 45.0 kg of rocks that contain 2.00% by mass of gold?

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