One Kind of Battery Used in Watches Contains Mercury(II)oxide

question 5

Multiple Choice

One kind of battery used in watches contains mercury(II) oxide.As current flows,the mercury(II) oxide is reduced to mercury.
HgO(s) + H₂O(l) + 2e^- → Hg(l) + 2OH^-(aq)
If 2.3 × 10^-5 amperes flows continuously for 1200 days,what mass of Hg(l) is produced? (F = 96480 C/mol e−)

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

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