Explanation
HBr (g) decomposes as follows:
HBr (g) => H2 (g) + Br2 (l)
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Lastly, the equation must be balanced:
2 HBr (g) => H2 (g) + Br2 (l)
(we must have the same number of atoms on both sides)
Answer: 2 HBr (g) => H2 (g) + Br2 (l)
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