The balanced chemical equation for the reaction of copper (Cu) and silver nitrate (AgNO3) is shown. Cu plus 2 AgNO sub 3 rightarrow 2 Ag plus Cu open paren NO sub 3 close paren sub 2 How many moles of copper must react to form 3 point 5 0 mol of Ag ?
Answer
A
0 point 1 7 5 mol
B
1 point 7 5 mol
C
7 point 0 0 mol
D
17 point 0 mol
Explanation
The balanced equation shows that 1 mol of copper forms 2 mol of silver. So the copper needed for 3.50 mol Ag is 3.50 ÷ 2 = 1.75 mol Cu. The correct choice is 1.75 mol.
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