Final answer:
In the reaction 2 H₂ + O₂ → 2 H₂O, when 154 mol of O₂ react, 308 mol of H₂O will be produced.
Step-by-step explanation:
In the reaction 2 H₂(g) + O₂(g) → 2 H₂O(g), two moles of hydrogen react with one mole of oxygen to give two moles of water.
To find out how many moles of H₂O are produced when 154 mol of O₂ react, we can use stoichiometry. Since each mole of oxygen produces twice as many moles of water, the number of moles of H₂O produced will be twice the number of moles of oxygen.
Therefore, when 154 mol of O₂ react, 308 mol of H₂O will be produced.