The element which is losing mass from the above reaction is Cu
Mg(s) + CuSO4(aq) -> MgSO4(aq) + Cu(s)
A compound simply refers to a chemical compound which contains two contains two or more elements which are chemically combined together.
So therefore, the element which is losing mass from the above reaction is Cu
Mg(s) + CuSO4(aq) -> MgSO4(aq) + Cu(s)
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