Reaction 2a

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The following figure shows a fragment of a sample that contains oxygen molecules, O2, (red spheres) and hydrogen molecules, H2, (white spheres).

 

 

If this mixture rects to form water, select what is the limiting reagent in this conditions,

 

 

Additional text

 

Right. The stoichiometry of this reaction is two hydrogens molecules per one oxygen molecule. In this sample there are 10 molecules of hydrogen and 6 molecules of oxygen. Hydrogen is the limiting reagent.
Wrong. The stoichiometry of the reaction is two hydrogens molecules per one oxygen molecule. In this sample there are 10 molecules of hydrogen and 6 molecules of oxygen. Hydrogen is the limiting reagent.
Wrong. The stoichiometric ratio (H2/O2) is 10/5 = 2/1. There is a defect of hydrogen.