2 Fe(III)-[cytochrome c3] + H2 <=> 2 Fe(II)-[cytochrome c3] + 2 H(+)
2 fe(iii)-[cytochrome c3] + h2 <=> 2 fe(ii)-[cytochrome c3] + 2 h(+)
2 Fe(III)-[cytochrome c3] + H2 <=> 2 Fe(II)-[cytochrome c3] + 2 H(+)
2 fe(iii)-[cytochrome c3] + h2 <=> 2 fe(ii)-[cytochrome c3] + 2 h(+)