Question

calculate the theoretical yield (in grams) of the solid product, assuming that you use 1.0 g FeC2O4×2H2O and that oxygen is the excess reactant.

FeC2O4×2H2O (s) + O2(g) ---> FeO(s) + H2O(g) + CO2(g)

Its balanced equation is 2FeC2O4×2H2O (s) + O2(g)----> 2FeO(s) + 4H2O(g) + 4CO2(g)

Answer 1

Here is an example of a stoichiometry problem I've posted. Just follow the steps.
http://www.jiskha.com/science/chemistry/stoichiometry.html

Answer 2

calculate the theoretical yield (in grams) of the solid product, assuming that you use 1.0 g FeC2O4×2H2O and that oxygen is the excess reactant.