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UPCAT Science practice question 19: In the balanced equation for the formation of water from hydrogen and oxygen gas, what is the coefficient of H₂? ___ H₂ + ___ O₂ → ___ H₂O

Correct answer

C. 2

The balanced equation is 2H₂ + O₂ → 2H₂O, which gives four hydrogen atoms and two oxygen atoms on each side.

In the balanced equation for the formation of water from hydrogen and oxygen gas, what is the coefficient of H₂? ___ H₂ + ___ O₂ → ___ H₂O

  1. 1
  2. 3
  3. 2Correct
  4. 4

Why C is correct

The balanced equation is 2H₂ + O₂ → 2H₂O, which gives four hydrogen atoms and two oxygen atoms on each side.

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