In the reaction 2H2 + O2 -> 2H2O, if 2 moles of O2 react, how many moles of H2O are produced?

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Study for the WJEC GCSE Chemistry Exam. Utilize flashcards and multiple choice questions, each with hints and explanations. Prepare effectively for your exam!

Multiple Choice

In the reaction 2H2 + O2 -> 2H2O, if 2 moles of O2 react, how many moles of H2O are produced?

Explanation:
A molecule balance shows the amount of water formed is tied directly to the amount of oxygen used: for every mole of O2 that reacts, two moles of H2O are produced. So if you have two moles of O2, you multiply by the water yield per oxygen mole: 2 × 2 = 4. This assumes there’s enough hydrogen present and the reaction goes to completion. Therefore, four moles of water are produced.

A molecule balance shows the amount of water formed is tied directly to the amount of oxygen used: for every mole of O2 that reacts, two moles of H2O are produced. So if you have two moles of O2, you multiply by the water yield per oxygen mole: 2 × 2 = 4. This assumes there’s enough hydrogen present and the reaction goes to completion. Therefore, four moles of water are produced.

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