Question

The balanced chemical equation for the reaction of copper (Cu) and silver nitrate (AgNO3) is shown below. Cu + 2AgNO3 mc001-1.jpg 2Ag + Cu(NO3)2 How many moles of copper must react to form 3.50 mol of Ag?

Answer 1

The balanced reaction is:

Cu + 2AgNO3 = 2Ag + Cu(NO3)2

We are givent the amount of silver to be produced. This will be the starting point. Calculations are as follows:

 3.50 mol Ag ( 1 mol Cu / 2 mol Ag ) = 1.75 mol Cu

Therefore, we need 1.75 mol of copper in order to produce 3.50 mol of silver.

Answer 2

Answer:

1.75 moles of copper must react to form 3.50 mol of Ag.

Explanation:

$Cu + 2AgNO_3\rightarrow 2Ag + Cu(NO_3)_2$

According to reaction 2 moles of silver are obtained from 1 mole of copper.

Then 3.50 mole of Silver will be obtained from:

$\frac{1}{2}\times 3.5 mol=1.75 mol$

1.75 moles of copper must react to form 3.50 mol of Ag.