When magnesium is added to copper sulfate there's no overall change in mass. The mass of the solution after combining the two will be the sum of the mass of the magnesium and the mass of the copper sulfate solution. According to the Law of Conservation of Mass, matter is neither created nor destroyed so the mass of the reactants must equal the mass of the products.
The following redox reaction will take place:
`Mg_(s) + CuCl_2_(aq) -> Cu_(s) + MgCl_2_(aq)`
The solid magnesium metal turns into soluble magnesium ion in solution. This might give the impression that it disappears but that's not the case, the mass doesn't change. Similarly, the appearance of solid copper metal from copper ion that was in solution might make you think new atoms are appearing when copper was present in the ionic form the whole time.
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