1. Chlorine
2. Sulfur
3. Selenium
Mole ratio of H₂ : O₂ is 2 : 1
∴ if mole of H₂ = 1.67 mol
then mole of O₂ =

⇒ that mole of oxygen needed to react with
H₂ = 0.835 molThe answer is A
Pretty sure it shows a chemical reaction
Answer:
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Explanation: