Final answer:
The coefficient for hydrogen in the balanced equation for the reaction of solid tungsten(VI) oxide with gaseous hydrogen is 6.
Step-by-step explanation:
The reaction of solid tungsten(VI) oxide with gaseous hydrogen to form solid tungsten and liquid water is represented by the following balanced chemical equation:
W0₆ + 6H₂ → W + 6H₂O
The coefficient for hydrogen in this reaction is 6, which means that 6 moles of hydrogen react with 1 mole of tungsten(VI) oxide to produce 1 mole of tungsten and 6 moles of water. Chemical equations are balanced not only at the molecular level but also in terms of molar amounts of reactants and products, ensuring the law of conservation of mass is obeyed.