Fill in the coefficients that will balance the following reaction: (Note: Use 1 as coefficient where appropriate.)
NaCl+
FeO →
Na²O+
FeCl?

To balance a reaction, the amount of reactants must be equal to the amount of products, as stated by the Law of Conservation of Matter. It may help you to keep track of  the number of each element in a list as you try to balance. It's not able to be balanced.

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements