Figure 9 shows the relationship between the volume of hydrogen and the volume of oxygen produced during the electrolysis. Give one conclusion that can be made about the volume of hydrogen produced compared to the volume of oxygen produced.

By reading values from the graph, we can establish the relationship between the volumes of the two gases.\n- When the volume of hydrogen (x-axis) is 4 cm³, the volume of oxygen (y-axis) is 2 cm³.\n- When the volume of hydrogen is 8 cm³, the volume of oxygen is 4 cm³.\nIn both cases, the volume of hydrogen is double the volume of oxygen. This gives a volume ratio of Hydrogen : Oxygen = 2 : 1. This is consistent with the formula for water, H₂O, which has two hydrogen atoms for every one oxygen atom.