What mass of copper(II) nitrate would be produced from the complete reaction of 25.1 g of copper, according to the chemical reaction shown below?
Cu + 2 AgNO3 ----> Cu(NO3)2 + 2 Ag
Here is an example of a stoichiometry problem I posted on Jiskha.
http://www.jiskha.com/science/chemistry/stoichiometry.html