With the mass percent of Fe, oxalate ion, and water; find the mass percent of potassium ion in the complex iron salt difference.

Question

Fe= 11.37%
H2O= 12.24%
oxalate= 28.01%

Answer 1

I don't understand the question.

Answer 2

mass percent by difference would be 100- (11.37+12.24+28.01)