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Answer:

It is balanced

Explanation:

  • The equation, 2AgI+Na₂S → Ag₂S+2NaI, is balanced because the number of atoms of each element is equal on both sides of the equation.
  • That is, there are two silver atoms, two iodide atoms, two sodium atoms, and one sulfur atom on the right and left the side of the equation.
  • According to the law of conservation of mass, chemical equations should be balanced for the mass of reactants to be equal to that of the products.