10 g of H₂ is mixed with 64 g of O₂ and reacted (2H₂ + O₂ → 2H₂O). Which reactant is limiting and what mass of water forms?
Correct answer B. O₂ is limiting; 72 g of water
Explanation
There are 5 mol H₂ and 2 mol O₂. 2 mol O₂ needs only 4 mol H₂, so O₂ is limiting and gives 4 mol of water, which is 72 g.
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