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In a typical fuel cell, the reactant ($R$) and product ($P$) are

• A
  $R=H_{2(g)} \cdot N_{2(g)}: P=N H_{3(a q)}$
• B
  $R=H_{2(g)} \cdot O_{2(g)}: P=H_{2} O_{2(n)}$
• ✓
  $R=H_{2(g)} \cdot O_{2(g)}: P=H_{2} O_{(n}$
• D
  $R=H_{2(g)} \cdot O_{2(g)} \cdot C I_{2(g)}: P=H C I O_{4( aq )}$