Question

Overall reaction of a hydrogen oxygen fuel cell is

• A. $2H_{(2g)} + {O_{2}}_{(g)} \rightarrow 2H_{2}O_{(l)}$
• B. $2H_{2(g)} + 4O{H^{-}}_{(aq)} \rightarrow 4H_{2}O_{(l)} + 4e^{-}$
• C. $O_{2(g)} + 2H_{2}O_{(l)} + 4e^{-} \rightarrow 4O{H^{- 1}}_{(aq)}$
• D. $4OH_{(aq)}^{-} + 4e^{-} \rightarrow 2H_{2}O_{(l)}$

Answer 1

Answer: (A)

$2H_{(2g)} + {O_{2}}_{(g)} \rightarrow 2H_{2}O_{(l)}$

Answer 2

At anode : $2H_{2(g)} + 4O{H^{-}}_{(aq)} \rightarrow 4H_{2}O_{(l)} + 4e^{-}$

$AtcathodeO_{2(g)} + 2H_{2}O_{(l)} + 4e^{-} \rightarrow 4OH_{(aq)}$

$Overallreaction:2H_{2(g)} + O_{2(g)} \rightarrow 2H_{2}O_{(l)}$