Respuesta :

superman1987

Answer:

B. PCl₅ → PCl₃ + Cl₂.

Explanation:

  • The conservation of mass is a phenomena that is applicable and found in chemical reaction but only balance chemical reactions.
  • Balanced chemical reaction means that: The number of atoms of the reactants = the number of atoms in the products.
  • In balanced chemical reaction; the atoms that enter and participate in the reaction will result from it and maintain the mass of each atom.
  • The first choice (A) is wrong that it is unbalanced chemical reaction,

H₂O → H₂ + O₂, the oxygen has 1 atom in the reactants side while has 2 atoms in the products side.

to be balanced and apply conservation of the mass it should be: H₂O → H₂ + 1/2O₂.

  • The second choice (B) is the right answer: PCl₅ → PCl₃ + Cl₂.

The number of atoms of P (1 atom) and Cl (5 atoms) are the same in both sides of reactants and products.

  • The third choice (C) is wrong that it is unbalanced chemical reaction,

Na + Cl₂ → NaCl, the Cl has 2 atoms in the in the reactants side while has 1 atom in the products side.

to be balanced and apply conservation of the mass it should be: Na + 1/2Cl₂ → NaCl.

  • The fourth choice (D) is wrong that it is unbalanced chemical reaction,

Al + Br₂ → AlBr₃, the Br has 2 atoms in the in the reactants side while has 3 atoms in the products side.

to be balanced and apply conservation of the mass it should be: 2Al + 3Br₂ → 2AlBr₃.

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