Answer to Question #314112 in General Chemistry for maddie

Question #314112

How many grams of Cu would have to react to produce 89.5 grams of Ag


1
Expert's answer
2022-03-19T02:44:52-0400

The reaction is:

Cu+2Ag(+)=>Cu(2+)+2AgCu + 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)=1/2ν(Ag)\nu(Cu)=1/2\cdot\nu(Ag)


M(Cu)=63.5g/molM(Cu)=63.5 g/mol

M(Ag)=107.9g/molM(Ag)=107.9 g/mol


89.5 g of Ag is:

ν(Ag)=m(Ag)/M(Ag)=89.5g/(108g/mol)=0.83mol\nu(Ag)=m(Ag)/M(Ag)=89.5 g/(108g/mol)=0.83mol



ν=m/M=>m=νM\nu=m/M=>m=\nu\cdot M

Then m(Cu):

m(Cu)=ν(Cu)M(Cu)=1/2ν(Ag)M(Cu)=m(Cu)=\nu(Cu)\cdot M(Cu)=1/2\cdot\nu(Ag)\cdot M(Cu)= =0.50.83mol63.5g/mol=26.3g=0.5\cdot 0.83mol\cdot 63.5g/mol=26.3g


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