The reaction is:
Cu+2Ag(+)=>Cu(2+)+2Ag
According to the equation, 0.5 mol (or 1 mol) of Cu would have to react to produce 1 mol of Ag (or 2 mol):
ν(Cu)=1/2⋅ν(Ag)
M(Cu)=63.5g/mol
M(Ag)=107.9g/mol
89.5 g of Ag is:
ν(Ag)=m(Ag)/M(Ag)=89.5g/(108g/mol)=0.83mol
ν=m/M=>m=ν⋅M
Then m(Cu):
m(Cu)=ν(Cu)⋅M(Cu)=1/2⋅ν(Ag)⋅M(Cu)= =0.5⋅0.83mol⋅63.5g/mol=26.3g
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