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Gold is electrochemically produced from an aqueous solution of ${Au{(CN)}_{2}}^{-}$ containing ${CN}^{-}$ in excess. At the electrodes, gold metal and oxygen gas were produced.

How many moles of oxygen gas will be produced during the production of 2.0 mol of gold metal?

A

0.50

B

1.0

C

2.0

D

4.0

E

8.0

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