Copper metal (Cu) reacts with silver nitrate (AgNO3) in aqueous solution to form Ag and Cu(NO3)2. The balanced chemical equation is shown. Cu plus 2 AgNO sub 3 rightarrow Cu open paren NO sub 3 close paren sub 2 plus 2 Ag The molar mass of Cu is 63 point 5 g over mol The molar mass of Ag is 107 point 9 g over mol What mass, in grams, of Ag is produced from a reaction of 31 point 7 5 g of Cu ?
The balanced equation shows that 1 mol of Cu produces 2 mol of Ag. The 31.75 g of Cu is 31.75 ÷ 63.5 = 0.50 mol, which produces 1.00 mol of Ag. At 107.9 g per mole, that is 107.9 g of Ag, so the correct choice is C, 107.9 grams.
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