The overall reaction of a hydrogen-oxygen fuel cell is

Question

The overall reaction of a hydrogen-oxygen fuel cell is (A) 2H2(g)+O2(g) →2H2O(l) (B) 2H2(g)+4OH-(aq) →4H2O(l)+4e- (C) O2(g)+2H2O(l)+4e- →4OH-(aq) (D) 4OH-(aq)+4e- →2H2O(l)

Tardigrade Admin · Accepted Answer

At anode: 2H2(g)+4OH-(aq) →4H2O(l)+4e- At cathode: O2(g)+2H2O(l)+4e- →4OH(aq) Overall reaction: 2H2(g)+O2(g) →2H2O(l)

Q. The overall reaction of a hydrogen-oxygen fuel cell is

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

$2 H_{2 (g)} + 4 O H_{(a q)}^{-} \to 4 H_{2} O_{(l)} + 4 e^{-}$

$O_{2 (g)} + 2 H_{2} O_{(l)} + 4 e^{-} \to 4 O H_{(a q)}^{-}$

$4 O H_{(a q)}^{-} + 4 e^{-} \to 2 H_{2} O_{(l)}$

At anode : $2 H_{2 (g)} + 4 O H_{(a q)}^{-} \to 4 H_{2} O_{(l)} + 4 e^{-}$
At cathode : $O_{2 (g)} + 2 H_{2} O_{(l)} + 4 e^{-} \to 4 O H_{(a q)}$
Overall reaction : $2 H_{2 (g)} + O_{2 (g)} \to 2 H_{2} O_{(l)}$

Q. The overall reaction of a hydrogen-oxygen fuel cell is

2H2(g)​+O2(g)​→2H2​O(l)​

2H2(g)​+4OH(aq)−​→4H2​O(l)​+4e−

O2(g)​+2H2​O(l)​+4e−→4OH(aq)−​

4OH(aq)−​+4e−→2H2​O(l)​

At anode : 2H2(g)​+4OH(aq)−​→4H2​O(l)​+4e− At cathode : O2(g)​+2H2​O(l)​+4e−→4OH(aq)​ Overall reaction : 2H2(g)​+O2(g)​→2H2​O(l)​

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

$2 H_{2 (g)} + 4 O H_{(a q)}^{-} \to 4 H_{2} O_{(l)} + 4 e^{-}$

$O_{2 (g)} + 2 H_{2} O_{(l)} + 4 e^{-} \to 4 O H_{(a q)}^{-}$

$4 O H_{(a q)}^{-} + 4 e^{-} \to 2 H_{2} O_{(l)}$

At anode : $2 H_{2 (g)} + 4 O H_{(a q)}^{-} \to 4 H_{2} O_{(l)} + 4 e^{-}$
At cathode : $O_{2 (g)} + 2 H_{2} O_{(l)} + 4 e^{-} \to 4 O H_{(a q)}$
Overall reaction : $2 H_{2 (g)} + O_{2 (g)} \to 2 H_{2} O_{(l)}$