In the reaction 2H2 + O2 → 2H2O, if 3 moles of O2 are available, how many moles

Practice Questions

Q1
In the reaction 2H2 + O2 → 2H2O, if 3 moles of O2 are available, how many moles of H2 are required?
  1. 3 moles
  2. 6 moles
  3. 1.5 moles
  4. 4.5 moles

Questions & Step-by-Step Solutions

In the reaction 2H2 + O2 → 2H2O, if 3 moles of O2 are available, 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. For every 1 mole of O2, 2 moles of H2 are needed.
  • Step 3: Determine how many moles of O2 you have. In this case, you have 3 moles of O2.
  • Step 4: Use the ratio from Step 2. Since 1 mole of O2 needs 2 moles of H2, multiply the number of moles of O2 (3) by 2.
  • Step 5: Calculate: 3 moles of O2 x 2 moles of H2 = 6 moles of H2.
  • Step 6: Conclude that you need 6 moles of H2 for 3 moles of O2.
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