Copper metal Cu reacts with silver nitrate open paren AgNO sub 3 close paren in aqueous solution to form Ag and Cu open paren NO sub 3 close paren sub 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 ?
Convert the copper mass to moles: 31.75 g ÷ 63.5 g/mol = 0.500 mol Cu. The balanced equation shows that 1 mol Cu produces 2 mol Ag, so this amount of Cu produces 1.00 mol Ag. At 107.9 g/mol, that is 107.9 g of silver, choice B.
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