In a hydrogen fuel cell, hydrogen gas and oxygen gas are combined to form water. Write the balanced chemical equation describing this reaction using the lowest whole-number ceofficients

Answer 1

2H2(g) + O2(g) => 2H2O(g)

This reaction would be a synthesis reaction (A + B => AB). 2 moles of H2(g) react with 1 mole of O2(g) to form 2 moles of H2O(g)