if a sample containing...

Question

If a sample containing 13.7 g of H₂ is reacted with 31.9 g of O₂, determine the theoretical yield of H₂O.

Answer 1

First balance equation

2H₂ + O₂ = 2H₂O

Next, find the limiting reagent based on mass of reagents. Whichever has the smallest amount of moles, is your limited reagent. I got O₂ (~1 mole compared to ~7 moles of H₂)

If you have 1 mole of O₂ you should make ~ 2 moles of H₂O based on the balanced equation.

Use the exact moles from 31.9g of O₂ to get the mole equivalent of H₂O and convert to grams and you should get your theoretical yield of H₂O.

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