Question

If 1.5 moles of copper metal react with 4.0 moles of silver nitrate, how many moles of silver metal can be formed, and how many moles of the excess reactant will be left over when the reaction is complete? Unbalanced equation: Cu + AgNO3 → Cu(NO3)2 + Ag Be sure to show all of your work.

Answer 1

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

This tells you that 1.5 moles of Cu reacts with 2 moles AgNO3 forming 2 moles silver.
There will be 4.0 - 2.0 moles of excess AgNO3 left over.