which equation obeys the law of conservation of mass?
h₂(g) + o₂(g) → h₂o(g)
h₂(g) + o₂(g) → h₂o(g) + 4he(g)
2h₂(g) + o₂(g) → 2h₂o(g)
h₂(g) → h₂o(g)
h₂(g) + o₂(g) → 2h₂o(g)
retry

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Accepted Answer

# Explanation:
## Step1: Count atoms in each option
- For $H_2(g)+O_2(g)\to H_2O(g)$:
Left - $2$ $H$ atoms and $2$ $O$ atoms. Right - $2$ $H$ atoms and $1$ $O$ atom. Not balanced.
- For $H_2(g)+O_2(g)\to H_2O(g)+4He(g)$:
New element $He$ is introduced. Violates conservation.
- For $2H_2(g)+O_2(g)\to 2H_2O(g)$:
Left - $4$ $H$ atoms ($2\times2$) and $2$ $O$ atoms. Right - $4$ $H$ atoms ($2\times2$) and $2$ $O$ atoms ($2\times1$). Balanced.
- For $H_2(g)\to H_2O(g)$:
New $O$ atom appears. Not balanced.
- For $H_2(g)+O_2(g)\to 2H_2O(g)$:
Left - $2$ $H$ atoms and $2$ $O$ atoms. Right - $4$ $H$ atoms and $2$ $O$ atoms. Not balanced.

# Answer:
$2H_2(g)+O_2(g)\to 2H_2O(g)$

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QUESTION IMAGE

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Explanation:

Step1: Count atoms in each option

Answer: