Batteries Used in Watches Contain Mercury(II) Oxide $\ell$ ) + 2 E^- ? Hg

question 31

Multiple Choice

Batteries used in watches contain mercury(II) oxide. As the current flows, mercury(II) oxide is reduced to mercury according to the following reaction: HgO(s) + H₂O( $\ell$ ) + 2 e^- ? Hg( $\ell$ ) + 2 OH^-(aq)
If 2.3 × 10^-5 amperes flows continuously for 1200 days, calculate the mass of mercury, Hg( $\ell$ ) , produced.

• A) 2.5 g
• B) 5.0 g
• C) 9.9 g
• D) 13 g
• E) 15 g

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