The mass of silver metal produced from 6.35g of copper is 21.574 grams
calculation
Cu + 2AgNO3 → Cu(NO3)2 +2 Ag
find the moles of Cu used = mass/molar mass of Cu
moles = 6.35/63.5 =0.1 Moles
by use of mole ratio between Cu to Ag which is 1:2 the moles of Ag is therefore= 0.1 x2= 0.2 moles
mass of Ag = moles x molar mass
= 0.2 moles x 107.87 g/mol = 21.574 grams
