Question

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gaseous methane (ch₄) reacts with gaseous oxygen to give gaseous carbon dioxide and gaseous water, producing flame and heat. the balanced chemical equation will be:

1. ch₄(g) + o(g) ® co(g) + h₂o(g)
2. ch₄(g)+ o₂(g) ® co₂(g) + h₂o(g)
3. ch₄(g)+ 2o₂(g) ® co₂(g) + 2h₂o(g)
4. ch₄(g)+ 4o(g) ® co₂(g) + 2h₂o(g)

Explanation:

Step1: Count C atoms

Left: 1 (CH₄), Right: 1 (CO₂) → balanced.

Step2: Count H atoms

Left: 4 (CH₄), Right: 2 per H₂O → need 2 H₂O (total 4 H).

Step3: Count O atoms

Right: 2 (CO₂) + 2×1 (2H₂O) = 4 → Left O₂ needs 2 (2×2=4 O).

Step4: Verify all atoms

C:1=1, H:4=4, O:4=4 → balanced.

Answer:

1. CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)