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15. Gold can be extracted from the surrounding rock by using a solution of sodium cyanide. While effective for isolating gold, toxic cyanide finds its way into watersheds, causing environmental damage and harming human health. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H₂O(1) → 4 NaAu(CN)2(aq) + 4 NaOH(aq) 2 NaAu(CN)2(aq) + Zn(s) → 2 Au(s) + Na₂[Zn(CN)4](aq) If a sample of rock contains 0.009% gold by mass, how much NaCN, in kg, is needed to extract the gold from 1 metric ton (1 metric ton 10³ kg) of rock as NaAu(CN)₂? To solve, you must translate 0.009% 0.009 g Au = Au by mass to a conversion factor which is 100 g rock

15. Gold can be extracted from the surrounding rock by using a solution of sodium cyanide. While effective for isolating gold, toxic cyanide finds its way into watersheds, causing environmental damage and harming human health. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H₂O(1) → 4 NaAu(CN)2(aq) + 4 NaOH(aq) 2 NaAu(CN)2(aq) + Zn(s) → 2 Au(s) + Na₂[Zn(CN)4](aq) If a sample of rock contains 0.009% gold by mass, how much NaCN, in kg, is needed to extract the gold from 1 metric ton (1 metric ton 10³ kg) of rock as NaAu(CN)₂? To solve, you must translate 0.009% 0.009 g Au = Au by mass to a conversion factor which is 100 g rock

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter3: Chemical Reactions
Section: Chapter Questions
Problem 107QRT
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15. Gold can be extracted from the surrounding rock by using a solution of sodium cyanide. While effective for isolating gold, toxic cyanide finds its way into watersheds, causing environmental damage and harming human health. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H₂O) → 4 NaAu(CN)2(aq) + 4 NaOH(aq) 2 NaAu(CN)2(aq) + Zn(s) → 2 Au(s) + Na₂[Zn(CN)4](aq) If a sample of rock contains 0.009% gold by mass, how much NaCN, in kg, is needed to extract the gold from 1 metric ton (1 metric ton = 10³ kg) of rock as NaAu(CN)2? To solve, you must translate 0.009% Au by mass to a conversion factor which is 100 g rock 0.009 g Au
Transcribed Image Text:15. Gold can be extracted from the surrounding rock by using a solution of sodium cyanide. While effective for isolating gold, toxic cyanide finds its way into watersheds, causing environmental damage and harming human health. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H₂O) → 4 NaAu(CN)2(aq) + 4 NaOH(aq) 2 NaAu(CN)2(aq) + Zn(s) → 2 Au(s) + Na₂[Zn(CN)4](aq) If a sample of rock contains 0.009% gold by mass, how much NaCN, in kg, is needed to extract the gold from 1 metric ton (1 metric ton = 10³ kg) of rock as NaAu(CN)2? To solve, you must translate 0.009% Au by mass to a conversion factor which is 100 g rock 0.009 g Au
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