Work Step by Step
The number of moles of gold: $1000\ kg\times 1000\ g/kg\times 0.012/100\div 196.97\ g/mol=0.61\ mol$ Number of moles of NaCN: $0.61\ mol\times 8/4=1.22\ mol$ Volume: $1.22\ mol\div 0.0071\ M=171.6\ L$
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