Question

how many grams of silver are produced if you have 75.0 grams of copper

Answer 1

$$Ag_2O + Cu = 2Ag + CuO$$

$$n(Ag) = 2n(Cu)$$

$$n(Cu) = m/M = 75.00g/63.55g/mol = 1.18 mol$$

$$n(Ag) = 2.36 mol$$

$$m(Ag) = nM = 2.36mol*107.88g/mol = 254.60 g$$