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The compound HBr can be decomposed to form H2 and Br2. This can be represented at the atomic level by a chemical equation:
2HBr H2 + Br2

According to the law of conservation of mass, if 29.5 grams of HBr decomposes and 0.4 grams of H2 is formed, how many grams of Br2 must simultaneously be formed?

The compound HBr can be decomposed to form H2 and Br2 This can be represented at the atomic level by a chemical equation 2HBr H2 Br2 According to the law of con class=

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EnglishRub05

The law of conservation of mass say that, in a chemical reaction, the mass of the reagents will always be equal to the mass of the products.

If we have 29.5 g of HBr, we must have 100 g of H2 and Br2 together, so:

  • 29.5 = 0.4 + Br2
  • Br2 = 29.1 g

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