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In the reaction 2H2 + O2 → 2H2O, if you start with 3 moles of O2, how many moles

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Question: In the reaction 2H2 + O2 → 2H2O, if you start with 3 moles of O2, how many moles of H2 are required?

Options:

  1. 3 moles
  2. 6 moles
  3. 1.5 moles
  4. 4 moles

Correct Answer: 6 moles

Solution: 

According to the stoichiometry, 1 mole of O2 requires 2 moles of H2. Therefore, 3 moles of O2 will require 6 moles of H2.

In the reaction 2H2 + O2 → 2H2O, if you start with 3 moles of O2, how many moles

Practice Questions

Q1
In the reaction 2H2 + O2 → 2H2O, if you start with 3 moles of O2, how many moles of H2 are required?
  1. 3 moles
  2. 6 moles
  3. 1.5 moles
  4. 4 moles

Questions & Step-by-Step Solutions

In the reaction 2H2 + O2 → 2H2O, if you start with 3 moles of O2, how many moles of H2 are required?
  • Step 1: Look at the chemical equation: 2H2 + O2 → 2H2O.
  • Step 2: Identify the ratio of O2 to H2 in the equation. It shows that 1 mole of O2 needs 2 moles of H2.
  • Step 3: Since you have 3 moles of O2, multiply the number of moles of O2 by the ratio of H2 needed for each mole of O2.
  • Step 4: Calculate: 3 moles of O2 × 2 moles of H2 per mole of O2 = 6 moles of H2.
  • Step 5: Conclude that you need 6 moles of H2 for 3 moles of O2.
  • Stoichiometry – The calculation of reactants and products in chemical reactions based on balanced equations.
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