4 g of hydrogen reacts with 16 g of oxygen: . What mass of water forms at most? (, )
Answer and explanation
Correct answer: D. 18 g
- Step 1: mol and mol; 2 mol H2 would need 1 mol O2. Step 2. Oxygen is limiting: 0.5 mol O2 gives 1 mol water g. Answer: 18 g. Why not the others: 36 g assumes hydrogen limits; 20 g adds the masses of the reactants; 9 g halves the yield.
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