Given the following equation: Cu + 2 AgNO3 - --> Cu (NO3) 2 + 2 Ag If 89.5 grams of Ag were produced, how many grams of Cu reacted?

mass of Cu = 26,34615g

Explanation:

The equation for reaction is

Cu + 2 AgNO3 - --> Cu (NO3) 2 + 2 Ag

1mol 2mol 1mol 2mol

mass of Ag that reacted = 89.5g

molar mass of Ag = 107.86h/mol

number of moles = mass/molar mass

number of moles of Ag = 89.5/107.86

=0.8298moles

from the stoichoimetric relation;

1mol of Cu reacted to produce 2moles of Ag;

hence 0.8298moles of Ag produce would require; 0.8298/2 moles of Cu to react

=0.4149moles of Cu

mass of Cu = moles of Cu * molar mass of Cu

molar mass (Cu) = 63.5g

mass of Cu = 0.4149 * 63.5

mass of Cu = 26,34615g