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How many water molecules (H2O) can be produced from 6 molecules of hydrogen gas (purple) reacting with 6 molecules of oxygen gas (turquoise)? Which reactant is the limiting reactant? Oxygen and hydrogen molecules A. 6 water molecules, hydrogen is limiting B. 3 water molecules, oxygen is limiting C. 3 water molecules, hydrogen is limiting D. 12 water molecules, oxygen is limiting
The answer is A. The reaction of hydrogen gas and oxygen gas is as follow: 2H₂ + O₂ =2H₂O. So two molecule of H₂ will react with one molecule O₂ and create two molecule of H₂O. Because after reaction, O₂ has leftover, H₂ is the limiting reactant.
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