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Large deposit of gold are found in veins of rock and can be seperated chemically by a two-step process:

(1) 4 Au+ 8 NaCN+ O2+ H2O ---- 4 NaAu(CN)2 + 4 NaOH

(2)2 NaAu(CN)2 + Zn ---- 2 Au + Na2(ZN(CN)4)

If a 1000 kilogram sample of rock is 0.021% gold by mass, how much zinc is needed to react with the gold extracted from the rock? Assume that the reaction is 100% efficient.

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