Verified Answer :

Willchemistry

Molar mass Cu = 63.546 g/mol  and AgNO₃ = 169.87

1 Cu + 2 AgNO₃ -> 1 Cu (NO₃)₂ +2 Ag

63,546 -------- 2 169.87
? g Cu ------- 45.0 

Mass ( Cu ) = 45.0 63,546 / 2 * 169.87

Mass ( Cu ) = 2859,57 / 339,74

Mass = 8.4169 g of Cu

hope this helps!

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